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Command which acts on the contents of logs

Hello All.
 I am sure I have seen this somewhere, but I cannot find it again. Is there a program that watches the end of a file as it grows (like a log file), and executes a user defined script when certain text appears in the log. If not, how can this be done.

Thanks in advance,
Nicholas Waltham
1 Solution
"tail -f some-file" watches the end of a file, continuously showing it's content as new info is added. You could pipe that to a script to watch for a specific string and it could act accordingly.

Just some addition (in addtion to jlevie comment :)

tail -f some-file | egrep "some pattern" | you-home-made-script.sh

Maybe you are looking for "login" in /var/adm/message

tail -f /var/adm/message | egrep "login" | logwatcher.sh

should do.  and don't forget that you need to write the "lgowatcher.sh" script yourself.

Exactly. The "cut" command will provide the filter to grab the interesting part of the text you need.
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