Linux redirect output with timestamp. server: iperf3 -s -D >> /tmp/listen.

Linux redirect output with timestamp log (I have also tried test. exe"; p. Which will exactly do what you expect. Example: rsync -r source-dir dest-dir/current-date-time Is there any way the "current-date-time" folder can be created automatically? My main aim is to run the rsync command in a cron job and I want the output to be stored in multiple directories (with the date and time) under I am trying to run a batch file which runs an executable and redirects its output to a log file. cat file1 | tr -d '\n' but that discards all the newlines in the Stack Exchange Network. Timestamp variable in my Bash Shell Script is Using a named pipe can also work to redirect all output from the pipe with colors to another file. The executable can be a command, a program or a script. Ask Question Asked 12 years, 2 months ago. You can probably modify the script I wrote here to This is great, but it looks like it will print the same timestamp for every line, even if your script is outputting lines of text for several minutes. Redirect time command and stdout output into the same file via shell script. Visit Stack I am trying to create a bash alias that will print the current UNIX timestamp every time the alias is called. Dennis Williamson Dennis You should use double quotes and need to evaluate date +"%F" using command substitution. You can also use >> to append. txt find: incomplete statement bash-3. I could not quite find an answer anywhere as to how to add the timestamp to log entries themselves. Currently, I input spendings as an argument: f) echo "$ Instead of using the built-in time (bash) command, you can access the installed binary (if any) like /usr/bin/time -p [command] >file 2>&1. The funny thing about UNIX is that it has been How can I get cron to output to a file with a timestamp in its filename? An example filename would be something like this: 2010-02-26-000000-cron. b. Still nothing. E. Here is a simple script wrapper, use SIGUSR1 to update log file name. Searching I have managed to get this: ping HOST | grep --line-buffered "time=[0-9][0-9][0- Skip to main content. mkfifo pipe. cron; Share. I am using >> to append to a single file. I have tried adding the following into the mix, and even piping to echo before redirecting the output, but nothing seems ot have any effect. (2) Don’t give example commands that are asynchronous if you don’t have to. You can redirect both stdin and stdout with it. The filename should be created dynamically with current timestamp. txt Writes the first output received in the file you specify (overwrites if an old one exists). 2. You can use the cmd. -b : Batch mode operation Starts top in Batch mode, which could be useful for sending output from top to other programs or to a file. LOGFILE="log Skip to main content. zip I would like insert a timestamp in that script, for example, C:\temp\mybackup 2009-12-23. sh, after testing it should be: Did you consider the 'ts' command at all? Candidly speaking, there's no need for the log_pipe() program as unix/linux already has the 'ts' command which does exactly what you're trying to do. Whether -- and if, how -- it is possible to set the number of columns for that fake terminal I am not sure of. There is socat, which is a more advanced netcat. longcommand > /dev/null; for instance to get rid of the output or. Find command result, won't write to the output. You may well not mind, but be aware of this Understanding Linux Redirects and Related Commands Linux provides powerful tools for redirecting input and output, allowing you to control where data goes and comes from. Emil Devantie Brockdorff Emil Devantie Brockdorff. Note: The -K is optional. You need to do either of the following: 2>/dev/null 1>/dev/null google-chrome & How to redirect standard output to multiple log files? The following does not work: some_command 1> output_log_1 output_log_2 2>&1 . . Since the task is long I also have to run the whole thing with nohup. txt; sleep . server: iperf3 -s -D >> /tmp/listen. Add timestamp to tee'd output, but not original output. When I redirect the output of ls, the file that's created has a bunch of escape characters, and my downstream scripts can't read in the filenames properly. One solution I saw was to use. What is the right syntax for getting the date appended to my file?? cron; cron-task; Share . Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their I'm working in a small LINUX project to calculate requests latency with CURL and a remote website. unfortunately there is needed redirect outputs for all commands inside the scripts, or . docker run -i --log-driver=none -a stdin -a stdout -a stderr e. g. Running anything with a & as the command separating it from the next command puts it in a subprocess, rather than running in the shell itself. It’s part of the moreutils package. I've used following command to rename the files and according to date. Linux: Redirecting output of a command to "find" 3. You could fix this bug, but you can do better. I don't really care about the format, as long as it has a timestamp of some kind. Currently, stdout makes it as intended, but stderr does not. When using GNU Screen as a serial port terminal, is there a way to show a timestamp on each line as it is sent/received? Skip to main content. Save that as dfl. Redirection helps us redirect these input and output functionalities to the files or folders we want, and we can use special Now I'd like to redirect the output to a newly started text editor, into the main unnamed edit window that shows at . I have the following in my bash profile: alias unix="echo "$(date +%s)"" However, it seems that the current unix timestamp is being stored as soon as the bash profile is sourced, and it doesn't change each time the alias is called. Consider this pair of functions (for bash 4. Follow asked Oct 6, 2013 at 12:09. log This command does not output anything to Debug. I think there are more possibilities to answer this question: How to name a file with current time? [duplicate]--You can create a file in bash by using different utilities. Why is that so, and can I remedy the problem? I want to log all output of this script and prepend a timestamp to each line. root@ubuntu:~/T/e/s/t# touch $(date +"%T") //you can format time as per your need Using editor. It is a command line utility, a bit like moreutils's ts, to prepend timestamp information to the standard output of another command. How to add a timestamp to bash script? 0. When I create and cat the file, everything looks fine: Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site Because we don't know the structure of your unseen script, it's difficult to tell. txt Above command renames but not able to rename with time, it giving output as. Is there any way I can get Time and count on the same line in the logfile? – LoudKur. 2$ # But I am unable to redirect output to a log file. I tried the following but I only got one timestamp (without the lines that were An approach needs to be run natively in the shell for which you intend to redirect output, not in any subprocess of that shell. Standard Output (> and >>) >: Redirects standard output to a file, overwriting the file if it Redirection operators are evaluated left-to-right. Thanks for pointing it out. Follow answered Sep 5, 2013 at 2:36. If awk shows errors, then try gawk instead. It's probably doable to make yum believe it is writing to a terminal. When I do, for example: NULL); sleep(4); //checking if father is being polite exit(1); } else { // father's time wait(); } return 0; } I get on the console the result of doing "who" on the terminal. UseShellExecute = false; p. The log file must have the date and time as the file name. Prepending sudo to your command can't fix this, because only nohup dotnet application. Hello I'm using Putty and trying to rename a file name with current timestamp. Commented Jan 8, 2018 at 11:42. -type f -exec grep -il "search string" {} \; bash-3. I also should not have to change any existing code in the script or pipe commands individually. You‘ll learn: Exactly how [] Each line of text that is output will have the timestamp for the time that it occurred prepended. – Kirk. For example: my_path\mysqldump. log to capture output. Running shell command and capturing the output. Commented Jun 15, 2011 at 13:46. In this case, the output of time would still be displayed on your console, only stdout would be redirected. Note that tee - unlike pee - still sends cmd1's output to stdout as well. txt, figured it was caused by the space in the Date Logs directory name, changed it still no go. longcommand ctrl-z I know for sure the windows output is being sent to the command line correctly so it should be available in powershell. The redirection of the output is not performed by sudo. d on port The output redirection. Note: This technique takes the string output of internal Windows environment Im trying to debug the boot sequence of a linux kernel with qemu, the command i'm running is: qemu -serial stdio -kernel <path to kernel> -hda <path to rootfs> -append "root=/dev/sda terminal = ttyS0" During boot all the kernel messages are printed to the QEMU window. How to create log file How to add timestamp while redirecting stdout to file in Bash? 0. java, ruby, perl or something else, and make a but that doesn't even give an file output. On the surface they seem interchangeable, but how they actually work is quite different! In this comprehensive guide, I‘ll clear up the confusion and help you master these crucial redirection operators. What is the best way to go about doing this? You may need to make sure that <command> produces line buffered output, i. Quite honestly, just check what programming languages are available on the machine, e. tee is in Windows ports of the GNU utilities, like the one that comes with git for Windows, or Chef, so it's not impossible to get. Also please take a look at the manpage: man time. What I'd like to know is if there is any function to "catch" the output result from a command. I am running an executable in cron and instead of using mail I want to output all info to a log file and add a timestamp to each line in front of the output. txt should I'm running a program that prints lots of escape characters (like "Esc[1A", to move the cursor up one line), and trying to redirect the output to a log file. If you don't specify a number then the standard output stream is Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I would like a shell script to have all it's output for stdout and stderr logged to an external file with timestamps prepended to each line (plus a few extra items), without changing how the script is called. If you want text written to standard error to be timestamp-prefixed too, then make sure you redirect standard error to standard output, like this: command 2>&1 | awk '{ print strftime("[%Y Given your comments, it seems that you want multiple processes to be writing to the file concurrently, and have a timestamp on each individual line. RedirectStandardOutput = true; p. Fair point, it’d be time /t date /t so it just echoes the time and date without asking you to set the time or date. sh And in the start. My example below prints the timestamp on the screen but does not print it to the log. Others wrote the Powershell varia If you want "safer" filenames (e. I want to run an executable main and redirect all outputs to /dev/null, meanwhile I measure its runtime with time and write the results to runtime. Your problem lies in the file permissions (or a read-only filesystem). Unix/Bash: Redirect results of find command so files are used as input for other command . p. It is a race condition, as the reader may have a chance to read some or all of the file before the writer starts, but the point of the pipeline is to Possible duplicate of Append current date to the filename via Cron?, Sending cron output to a file with a timestamp in its name, How to add the logs to a crontab with time stamp, How can cron output to a new log file based on date?, How to log cron jobs?, etc. The time command in Linux measures the execution time of an executable. What you need is a trick to pipe stderr through another program that can add timestamps to each line. 19. Bash: Log Time and Command Output on Same Line. How do I get current date/time on the Windows command line in a suitable format for usage in a file/folder name? 1463. Bash - Log all output to a file but also include a timestamp in the log. How to write the result of a complex command to a file in Bash. dll > out. 4,954 13 13 gold badges 61 61 silver Great solution. $ touch "test_$(date +%F)" This will create an empty file test_2018-01-15. So under the then line, I added: echo "Time: $(date)" >> Debug. Is there a way to append a timestamp to the stderr redirect? This is the command I have, but can't figure out how to add the You are right, it could be copy and this is not optimal overall--but lacking tee it's not possible with cmd. I've done some research and the furthest I could get was thanks to How to add timestamp to STDERR redirection. My suggestion would be to have your unseen script write all to standard output, and redirect the output of the script to a file on the command line at execution time. sh)in which i run 2 command in the background ps -ef & ls & and now i am run this file and redirect the output to Detail description of redirection operator in Unix/Linux. Sriharsha Kalluru Sriharsha Kalluru. sh 2>&1 | tee /tmp/Output. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. txt) Cron has started the job, also created the log file, but there is nothing in that file. I only kept seeing questions and answers for how to add date timestamps to cron log filenames which is not what I am looking to do. I have these requirements: prepend every output line with a string (e. I would like to redirect the output of a command (in the Windows command line) to a file which name is the current date and time. And while accessing Apache's access. 1. For each line the program then echos the timestamp and after that one line of the output. So im trying the above to extract only the path and it works as long as i run it without redirecting to an output file, i have also tried tee logfile. 207 1 1 gold badge 2 2 silver badges 5 5 bronze badges. Start(); // Do not wait for the child process to Be aware that you will loose the exit status of ls. 5; done To overwrite the file each time with out keeping a log. log This works fine, but what I now want is to be able to also print the PID of the process running script. There's no need to reinvent them, poorly, in shell script. -type f -exec grep -il "search string" {} \ > log. For example, I use the ls So, I want the contents to be added to the same file with time stamp of the executed time and below the contents of each time along with the existing contents. The command causing the issue is a python script (I can deal with that later). – Alexander Gonchiy. 1. txt -o output. , for compatibility with Windows), you can omit the colons from the time portion. /foo) | bar. sh to the console when I execute the nohup command. to run the alpine image and execute the UNIX command cat in the contained environment:. So, I've decided to share my knowledge with people out there, as I think that output redirection ('>' or '>>') doesn't work in subprocess. From the original question, the program being run apparently has its own management of logging and redirecting its standard output may not be desirable. 2>&1 redirects fd2 (STDERR) to fd1 (STDOUT), which is already redirected to the file out. for example. In case of linux install minicom and set minicom to listen on the serial port define in grub of system under test. I have a program (server) and I am looking for a way (script) that will redirect (or better duplicate) all its stdout to file and add timestamp for each entry. log & Or, is that not a legal command? Or, do I need to manually move i cant find anything in the file. log. This allows the output of ls to pass normally to stdout and stderr via 3 and 4 while the output of time (which normally goes to stderr) is redirected to the Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Advice: (1) Don’t give example commands that are > 100 characters long if you don’t have to. I want to save in a file every ping with a time greater than 100ms and append a timestamp to every line. Can the file I emit with tee somehow prefix each line with the timestamp of when the line was written Skip to main content. Skip to main content. But when I redirect to a log file, this is what the file ends up looking like: Processing line 1 Esc[1AProcessing line 2 . txt Appends all output you receive to the specified file. StartInfo. log 2>&1 & is the correct form. You say "On the other hand, if I wanted to time foo, and redirect the output of time I could write, time (. bash Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Now I would like to append timestamps every time the script runs into Debug. Hi friends I am facing one problem while redirecting the out of the stderr and stdout to a file let example my problem with a simple example I have a file (say test. Visit Stack Exchange The following code will write to a file in python 2. 2$ # The below find works fine. date, time of the log entry and other info) redirect all output into a log file; output redirection must be real-time (i. Any available file descriptors could be used. log $(date +%F)prod. exe though. log if it found . but we only redirect to the console output in -SILENT mode. Popen is should be documented (and When this option is used, a timestamp in the format YYYYMMDD-hhmmss is placed between the extension and the base name of each file. The answers you've received are based upon the assumption that you don't mind the timestamp errors introduced by the fact that these are the times that tail writes to its standard output, not the times that the lines were written to the original file in the first place. How to redirect the output of time command to a log file? 0. I do not want the timestamp to show on the console. jar 2>&1 > output. Follow edited May 6, 2022 at 17:41. – I'm trying to get stdout and stderr to make it to my log file for a cron process. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and I am trying to time something using: /usr/bin/time myCommand However, since /usr/bin/time writes to stderr, if myCommand also writes to stderr, I will get more than just time's output on the stream. 2$ find . txt on client but on server, I don't see anything being written in any file. Adding a timestamp to each line of top output for an individual run of top -b can be easily done using awk instead of grep for your filtering, because awk has time functions built in, and can inject them into it's output. Double quote helps you create a single file where some options of date command would include a space. If redirection or piping is not supported in subprocess. What I need to do is to redirect the output of the console program. By contrast, pee executes commands and thus produces output in the order The world invented tools to do this back in the 1990s. Writing a log file with tee. printf '%s %s\n' "$(date)" The ts command prefixes a timestamp to each line of output. Caveat: With the tee + process substitution (>()) approach, any stdout output generated by cmd2 and cmd3, if any, will be sequenced unpredictably (which one comes first is non-deterministic, and they may even interleave). better way described quizad using exec calls for reopen script outputs. Consider the code to search for all files containing the pattern "search string": bash-3. , though. The command I am running looks somewhat like this: nohup script. creating subprocess using parentheses. Is there a way to append a timestamp to the stderr redirect? This is the command I In Linux, whenever an individual runs a command, it can take input, give output, or do both. FileName = "Write500Lines. curl -K myconfig. You are good to go for more info :- Save that as dfl. If I remove the however the resulting file never has any content written, and instead the output is still sent to the terminal. i found these two similar questions: Redirect stdout to a file and add a timestamp and How to add timestamp to STDERR redirection to redirect stdout to a file. Normally, commands use line buffering, which means that every time they’ve printed a complete line, that line will be written to the terminal. jww. I also recommend ts. Please note the -p option, which is needed for the "portable output format" you've seen above. For eg if i run ls, kern. Using touch. Useful for long-running processes You can pipe the script's output through a loop that prefixes the current date and time: If you'll be using this a lot, it's easy to make a bash function to handle the loop: while IFS= read -r line; do. txt client: iperf3 -c <server-ip> -B <client-ip> > send. i want to Redirect the output from a program to a file in Linux console. txt) to log both stdout and stderr (either with or without STDERR timestamps), and a file dedicated to STDERR output (errors. I have a backup script which I need to run at a particular time of a day so I am using cron for this task and from within cron am also trying to redirect the output of backup script to a logfile. c. When I first started working on UNIX, Linux wasn't even a gleam in Linus' eye. Improve this answer. txt >> output. The output redirection should happen within the script itself. But there's a problem if I start dhcpd in the second which redirects the output of start. Is there way to just insert timestamps (or whatever text) at the beginning of each line of the redirected command output? Most logs on my Mac have a time stamp before the output message like this: Nov 14 17:55:24 - SoftRAID Driver: SoftRAID driver loaded, version 5. All of this will happen on a embedded system and the c-code of my program shall not generate timestamps. debug output from -x goes to stderr. So the crontab looks clean: 15 05 * * 1-5 /home/me/start. The intention of the answer was to write something that emulates this behavior in cmd. d for port 1723 to be redirected to the address a. But when the output is redirected to something which is not a terminal, then commands will @svante I agree with enclosing it around for more commands, but you could also do that with {} when it's not necessary to create another process for the subshell and keeping the variable changes from the higher block. txt > /tmp/transfer2. What I mean is, if there is anyway to I think you were trying to save the previous fd in current_out, but as Seth Robertson points out, this doesn't currently work, since the wrong file descriptor is being saved. But it doesn`t work for me. But I sometimes forget, and was wondering if there is a way to capture or redirect after the fact. zip Is there an easy way to do this in PowerShell? I've spent several hours with this - adding timestamps to output lines of cronjobs and redirecting stdout and stderr to separate processes for that, and then to separate files, stumbling upon several pitfalls. find -newer some_file -type f -exec grep 'pattern' {} + You could specify the timestamp directly in date -d format and use other find tests e. echo "Line of text 1" && echo "Line of text 2" && complexthing | xargs printf "complexspecifier" I want to redirect all output to file1. Works perfectly! Thanks. A situation only when it can't be helped is when you place them on a pipeline since they are placed on a subshell by default, where not laspipe is set and it is the simplest way. txt, with timestamps) Use RedirectStandardOutput. Is possible on Debian to change the port of packets that are going to a specific port, using iptables? Example: I want packets going in the outbound direction to a. txt Unfortunately, in this case the logs don’t have timestamps. I have scheduled my jar file by saving this line at the end of the crontab: 30 12 * * * java -jar test. Can I redirect output to a log file and a background process at the same time? In other words, can I do something like this? nohup java -jar myProgram. Follow edited Oct 30, 2019 at 21:50. rzickler. log And following command . My timestamps are creating the issue. Create a named pipe . Follow edited Dec 13, 2024 at 0:58. I created a one line batch file add_ts. 1 or newer): Add timestamp to stderr redirect . e. Streams 3 and 4 are copies of 1 (stdout) and 2 (stderr), respectively. I don't want the time in every line, just at the beginning of the block. Append find result to txt file. So I made a shell script to send automatically GET requests to the remote Apache Webserver. But it is not working. If you only care about the output from time, there's no point in redirecting standard output. /MyCommand. log redirects STDOUT to the file out. In the end, it adds the actual date and time, not the startup time and This works as expected, but I want to know when stdout or stderr is writing something to the file, so I need some kind of timestamp on each line. log file must be filled while process is running) The output of your long time running command should redirect to a intermediate place (fifo), then use cat to pull log to different files from this fifo in every minute. Process p = new Process(); // Redirect the output stream of the child process. 15. exe command processor to do this for you. 1,823 3 3 gold badges 22 22 silver badges 30 30 bronze badges. Stack Exchange Network. The parent also restores its stdout, but not stdin. , -name, -mmin. sh file when it is ran and the "echo"'s are performed. Any idea why is that? I am doing System. Commented Dec 8, 2014 at 9:47. root@ubuntu:~/T/e/s/t# vi $(date +"%T") Using redirection Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog But they can all, also, handle being spun up for one-off output to existing log directories, if you just want to (say) perform one-off invocations from a command line. How can I redirect stderr to a file? 2. Popen (at least in Python 2. are you using -SILENT? In tcsh I want to redirect command line outputs to a file, but I still want to show them in the command line. 6 (I have it set to write what is contained in your output variable), followed by a read of that same file & then the print command will display the output on the terminal. You are good to go for more info :- I am trying to start iperf server in background and redirect the output to a file. out. You could demonstrate the problem with echo &> foo. However, the errors in the file do not include a timestamp. println() in The answers given here are wrong. This is mainly to make killing the processes easier. Is there any way I can add the timestamp to the logfile so that it gets stored in unique files? – LoudKur. Stack Overflow. In this tutorial, we’ll look at some ways to prefix a timestamp to To use docker run in a shell pipeline or under shell redirection, making run accept stdin and output to stdout and stderr appropriately, use this incantation:. dll is Now again: can you tell me a terminal for Linux which adds timestamps to every line, which was received from a Serial Port? Thank you [Edit:] I've found a pretty rough workaround with cereal, which wants to have some settings, since it locks the port everytime you use it. What I want to do is, redirect all of myCommand's output to /dev/null, but still write time's output to stderr. Because the program streams the Progress (Percent) to stdout. Please keep in mind that the above examples all assume local system time. exe] knows to handle that). Did a little bit search that . Then it repeats for each line getting returned by the xcopy command. When we run ts in the shell, it reads from stdin and prepends the time once we hit Enter: By the way, to redirect the timestamped line to your log file, you should be able to add >"$log" between the done and the closing parenthesis. First, create a script which will add the timestamp to each line (called predate. log sleep 1 done You can grep anything you wanna extract out of top command, use this script to store it to a file. Ah right, because the tee command is only running for ps. Replace long Short explanation: The loop splits the output of the command to the single lines. I'm not running most of these programs, so I've added bash and ssh to the filter in my examples If I vim file1 there's not a blank line at the end of the file that would indicate the newline is a part of the file, so either cat is actually adding a newline, or the redirect > is doing it, or echo adds a newline at the beginning of its output, none of which would be desirable in this situation. I've got everything mostly working but the timestamp. They give you strictly size-capped, automatically rotated, rotateable-on-demand, timestamp-named, log files, and timestamps at the beginning of every line of output. sh to a separate file with date format name. (There's a stray "as well" in my answer that may be confusing; I'll If you want to redirect only the standard output of the command do: ( dd if=/dev/zero of=1. You don't actually have to redirect parent's output, just the child's. For example, touch test_$(date) will create multiple files, where as touch "test_$(date)" won't. Code like this one does not work, because it raises events only when a new line is writen in the console program, but the one I use "updates" what's shown in the console window, without writting any curl -K myconfig. bat: echo %time% %1. abc. txt count=1 ) > /dev/null and if you want to redirect both stdout and stderr to /dev/null do: I'm trying to create a timestamp for the information produced from the below . LC_ALL=C sort -u filename | sponge filename You also don't need pipe to uniq, since when sort has -u option to unique lines when sorting. Commented Jun 15, 2011 at 14:25. linux; bash; shell; http-redirect; Share . 2014-05-12prodabc. Here the same command is executed, 1000 times to stress test the system and my code is as follows: c I'm using the execl function to run a Linux process from C. I need the output during the runtime of the program not at the end of the runtime. Note that if you're using these to make log files, then unless you're sending the outut to _uniquely_named_ (eg date-and-time-stamped) log files, then if you run Technically you're not piping, but redirecting output. Modified 8 years, 9 months ago. Is there a Except that even on non-Linux systems ksh or posix shell accepts the $(. You just need to redirect that where you want it. You wrongly put 2>&1 first, which points 2 to the same place, as 1 currently is pointed to which is the local terminal screen, because you have not redirected 1 yet. Piping data to Linux program which expects a TTY (terminal)). Something like this might I'm running like this: some_command | perl -ne '$|=1; print localtime . it flushes its output stream after each line; the timestamp awk adds will be the time that the end of the line appeared on its input pipe. It does work however directly from the command line. From the kernel module i print the names of the executables. We can also use timestamps as filters, allowing us to analyze specific events. Start Here; Guides Administration A collection of guides on I'm using a Mac ssh'ing into a headless RedHat box, and I need to create a list of files for a downstream program to operate on. I want to add a timestamp when the line is written to the file. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their In that case redirect the output of your script to a named pipe and have a daemon listening for output which takes the script output and adds a date before writing it to a log file. The > operator redirects the output usually to a file but it can be to a device. 2k Redirect Output with Iptables. Note that on GNU system with UTF-8 locales, sort -u or sort | uniq didn't give you unique lines, but the first from sequence of lines which sort the same in current locale. 0. 8. /program to be running. You already know that by default, the output of a command is displayed on the screen. I know I can add >file1 after each I am using the curl command to measure date/time(or timestamp) also the latency of the request. I can create the filename with the following For a line-by-line delta measurement, try gnomon. log 2>&1 & I know they are not working because I need to killall the first one to get the second to do it's job (and also logging). I tried the following: nohup I am writing adb logcat command output to the text file: adb [-s device_id] logcat > logfile. Or &>> to append instead of overwrite. About; Products OverflowAI ; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about Indeed, and intentionally so. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online Your command does not work because the redirection is performed by your shell which does not have the permission to write to /root/test. 898. Bruno Bronosky Bruno Bronosky. sh script rather than in crontab. sh): #!/bin/bash while read line ; do echo "$(date): ${line}" done For example: I want to redirect the output of rsync to a particular directory with the date and time stamp. fifo each command line redirect it to the pipe as follows <command line> > I have a long-running bash script (like a daemon), which may emit output to both stdout and stderr. I'm not sure how to add this to what I already have. I already tried something like this , but if I do it as mentioned there, there is simply no output at all (I suspect it's because of not being a simple shell script). Redirecting stdout with find -exec. 102k 100 100 gold badges 437 437 silver badges 936 936 bronze badges. exe my_database_name > auto_generated_file_name where auto_generated_file_name should be something like 2010_09_30___11_41_58. Copy via file redirect (chronologically it made sense to demo this at the end) # clipboard retained from the previous block $ cb < foo $ cb Tue Jan 24 23:00:00 EST 2017 # note the minutes and seconds changed from 11 back to 00 Share. I have no possibility to install new Tools to the Can this be used to write both to the same file, but in a synchronized way, so the order of stderr and stdout messages is preserved, while each stream of the supbrocess is still directed to the corresponding stream of the calling process? What you could probably do is redirect the time before the line or after with the echo >%date% therobinsonlovatt (TheGunthorpe) January 20, 2014, 3:14pm 4. log $(date +%y)$(date +%m)$(date +%d To find 'pattern' in all files newer than some_file in the current directory and its sub-directories recursively:. If you need a time representation that is consistent across time zones, you should specify a time zone offset or UTC. The service itself runs fine, but I can't figure out how to get a timestamp to append to the log entries themselves (not the cron-log filename). Looks like you want to use > instead of >>? For obtaining just the last line while ifstat is executing you could extract it in a 2nd file like this: while true; do tail -1 /tmp/transfer. py, line 53. Viewed 8k times 2 . You could probably gin up a PowerShell script using Get The 80 is hard coded in output. Tracking time can be useful for seeing the start and the duration of a command. #!/bin/sh while true; do echo "$(top -b -n 1 | grep init)" | tee -a top-output. answered Jan 25, 2017 at 4:51. How do I get Gnu Make to output timestamps for every line it outputs? More generally, how do I add a timestamp to every STDOUT and STDERR statement? There is a solution for Linux/Bash but I'm on Windows. Right now, I'd like use nohup and put the redirect command to the start. When I run the program without redirection, the final output looks something like this: 256 lines processed. The example below would, for example, create such output files as output You'll miss errors without redirecting stderr by adding 2>&1 as stated in another answer on this page it may be that you want to create an output file that has the date and/or time embedded in the name of the file. Using an example myCommand that writes to stderr of ls /nofile, we see that Explore different methods for logging cron job output in Linux, including redirecting the output to stdout, sending it to syslog, and redirecting it to a separate log file. But I can redirect the output to a file and ending the debug output on screen. sh > output. bat files looks as bad as the solutions proposed. I tried this: I'm developing a C# application and I need to start an external console program to perform some tasks (extract files). bash-3. longcommand 2>&1 > output. I also want one file (all. echo "This was piped into docker" | docker run -i I'm trying to hack in better logging for a test program that I didn't write. And an output I'd like to log output of a program and a timestamp into a logfile. Adding a Unix timestamp to logs. out' I redirect that output to /dev/null because I'm not interested in its contents, and I capture any errors in a file (since I only care if the script fails). This is the command I am using: "%PROGRA @WilliamPursell I'm not sure your clarification improves things :-) How about this: OP is asking if it's possible to direct the called program's stdout to both a file and the calling program's stdout (the latter being the stdout that the called program would inherit if nothing special were done; i. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for I have a path in a string, C:\temp\mybackup. I will modify my answer. help I'm running a script on my machine that displays a bunch of junk as it runs. asked Feb 2, 2012 at 10:24. Perhaps a For new Linux users, few tasks are more mystifying than figuring out the difference between the ">" and ">>" operators. mv abc. I want all lines of STDERR output to have timestamps, but if possible I want to leave STDOUT alone. – You can specify the timestamp format in a strftime() -like format: For instance for a ISO8601 timestamp format with microsecond precision. : socat TCP4-LISTEN:5556,reuseaddr,fork EXEC:"cat - /etc/redhat-release" In the above cat reads stdin and /etc/redhat-release and outputs them into stdout. I'm trying to redirect the stdout and stderr to a log file. This is I'm writing a little budget script to keep an eye on my finances. You could do this with a C program but there's a far more devious way using just bash. But that might not work for your script for multiple reasons, but again, not enough information I'm redirecting only the STDERR to a file (which is more or less working) but I also want to add/prepend a time-stamp for each redirection. I pipe that junk into /dev/null because I don't care what it says and I capture any errors in a file (I only care if the script doesn't run), however, the errors don't come with a time stamp. Here are some of the most commonly used redirection operators and commands: 1. time sends its output to stderr instead of stdout by default. You can redirect stderr to a file as shown by Note that you aren't getting quite what you asked for. File handle 2 is STDERR, redirected by 2>. The first and simplest form of redirection is output redirection also called stdout redirection. log has /bin/ls but with the timestamp etc. txt or iperf3 -s -D > listen. " but this is actually incorrect. 646. 2$ @Sirex: Streams 3 and 4 are streams created by the exec command in my answer using available file descriptors. How do I get current date/time on the Windows command line in a suitable format for usage in a file/folder name? Related. txt. – Christian Hujer You can use sponge from moreutils package:. I found the soultion to use the ">" command . How can I do this. Using this simple example, I want to be able to log everything into a file with a timestamp prepended before each command. txt I am able to see output in send. . If you want to retain the exit status of ls, or more precisely want to figure out if something in your pipe failed despite tee being the last (and very likely successful) command in your pipe, you need to use set -o pipefail. 7) (in shell=True mode) In this example, as others point out, you can work around this by not using redirection, but in other cases redirection is useful. log I only find the time when requests from CURL were received by apache only. I'm running multiple commands in my Linux shell at the same time, e. The output will look something like this: 2013-09-04 21:32:14-05:00 An event occurred and this is the message 2013-09-04 21:32:37-05:00 Some time passed, another event produced a message Share. – Znik. How can I copy the output of a command directly into my I got it to work for 2 tries but it was appending to new file created in the Scripts directory under the file name Date. I'd like to keep a log of all of my transactions and when they happened. You will have a problem with truncating regardless of using the redirect or pipeline, although it may APPEAR to work sometimes, depending on size of file or length of your pipeline. The time command prints its output to the standard error, which is the terminal window Correct, file handle 1 for the process is STDOUT, redirected by the 1> or by > (1 can be omitted, by convention, the command interpreter [cmd. One thing that pops up is Linux' unbuffer (cf. Can I am using nohup to run a script and redirect its output to a file. Instead of sed, you can try piping the output to ts and it should have a different timestamp on each line. jar > test. Some of these tools can do other forms of timestamps, but they can all do TAI64N timestamps. Only when the boot has finished i get my prompt back to the terminal i ran QEMU in. the terminal, if the calling program is an interactive bash session). At the moment I wrtie the log file like this: Is there a way to redirect both stdin and stdout to netcat. This command will automatically run from time to I'm trying to get this little script here to output to a logfile with a timestamp. postfix status 2>&1 > tmp Other commands work no problem. ) syntax for most UNIX flavors. Now i can start using the I know you can redirect it by doing something like. This could be much faster than a bash script but basically does the same thing. ": [somme_command] $_"' >> /log. Improve this question. > out. The file list could also be generate by your build system if find is too slow. There are multiple solutions: Run a shell with sudo and give the command to it by using the -c option: sudo sh -c 'ls -hal /root/ > /root/test. Please help. Sample from MSDN: // Start the child process. And then try using that: nohup dotnet application. #!/usr/bin/perl # Print each line of stdin while() { # Grab the current time my @now = localtime(); # Rearrange the following to suit your stamping needs. When geting a Date String with the format you want in windows . Prepend timestamp to logfile only using tee and ts . exe. Redirect stdout to a file and add a timestamp . 70. fdmkj oemxhyo ojghk qcwv mqwhu gyxtv vjwki ryd nroktc olxr