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
nwalthamAsked:
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samriConnect With a Mentor Commented:
nwaltham,

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.

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