Aug 22, 2017 · tail -f filename, how to quit the mode without use Ctrl c to kill the process. You can't do that. Perhaps you wanted to run tail -f somefile | less. The Ctrl c is interpreted by the tty subsystem (and by your shell) and sends a SIGINT signal …

Dec 11, 2013 · To achieve what you want you can start the tail -f in the background, remember its PID and kill it as soon as you do not need it anymore. Running in the background and using a pipe at the same time is tricky. The easiest way to do it would be to use a named pipe (FIFO): tail -f log > log.pipe & tail_pid=$!

May 31, 2023 · I'm trying to come up with a script for managing jobs on a supercomputer. The details don't matter much, but a key point is that the script starts to tail -f a file once it appears. Now this would run forever, but I want to cleanly stop it and exit the script once I detect that the job is finished. Unfortunately I'm stuck.

You can pipe the tail -f into sed, telling it to quit when it sees the line you're searching for: sed will output each line it processes by default, and exit after it sees that line. The tail process will stop when it tries to write the next line and sees its output pipe is broken.

Start tail with --pid=$$, that way it'll exit when the bash-process has finished. It'll cover all cases I can think of (server hangs with no output, server exits, server starts correctly). Dont forget to start your tail before the server. tail -n0 -F logfile 2>/dev/null | while read -t 30 line

Apr 24, 2011 · In general pressing Ctrl-C sends the 'interrupt' signal, aka SIGINT, to whatever is running. It tells the application that that the user wants to interrupt whatever it is currently doing. Many applications will exit when the get that signal, as tail does, others may stop doing something but continue running. –

Apr 29, 2015 · tail -f logfile | grep -q "Server startup in" It will search for the string in logfile and grep exits silently after the first new line that contains the string appears. As soon as the command exits, the string is found and you can continue the script..

Feb 16, 2014 · On Linux, you can use tail --follow=name (rather than just -f, which is equivalent to --follow=descriptor) to achieve what you want, but ONLY if the file is DELETED rather than moved - once the file is deleted, an error message is reported and tail exits (with code 1); sadly, by contrast, if the file is merely MOVED (renamed), tail does NOT ...

Mar 31, 2024 · Exit code, also called “ exit status” or “return code” is an integer value from 0-255 used by a command or script to indicate its success or failure during execution. It typically denotes whether a program has run successfully or has encountered any error condition or failure.

Mar 28, 2008 · I would like to add the option to do a 'tail -f' on a log file so I can view them in real time. The problem is that exiting out of that tail by pressing ctrl c/z kills the script, and returns me to the shell prompt.