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This question already has an answer here:

How can you stop a tail -f command after seeing a specific string/word?

I'm trying to follow an expanding log and stop the tail after finding a specific word. Is there any kill command for that? I'm just starting with UNIX.

marked as duplicate by MelBurslan, Jeff Schaller, jimmij, don_crissti, G-Man Jun 24 '16 at 23:52

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  • Surely, tail -f is a command that you ran from the command line? So then doing a Ctrl C – Kevdog777 Jun 24 '16 at 14:34
  • actually no, ill be using it inside a script. I wanted to follow a log that is expanding then i want to stop the tail command if it see a specific string. – jaybee Jun 24 '16 at 14:52
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pgrep -f 'tail -f your_filename'|xargs kill
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you can enable the grep line buffering if you want to tail file with ongoing writing:

tail -f your_file | grep --line-buffered your_pattern

else if the file is static you can grep your file the pattern you are looking for.

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    tail -f log.txt | grep --line-buffered "error" like this? – jaybee Jun 24 '16 at 14:22

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