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I have a file called alarm.log, and I want a script to automatically run when this file is changed.

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  • your-script < tail -f alarm.log Commented Oct 7, 2016 at 9:26

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You should check out inotify, specifically inotyfywait (man page here).

Basic usage:

while inotifywait -e modify alarm.log; do <myScript>; done

There are plenty of good examples of usage in this thread.

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  • I have a file script who ping host and when to someone host has packet lost write in log file. Commented Oct 19, 2016 at 9:24
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If you are running systemd, check out systemd.path . Systemd path units use inotify internally, but by using a systemd unit you get a service that is running in the background independently of your login session.

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