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I am looking for a fast script that will parse a large mail.log, and return the portion between two specified timestamps. I would like to run it on all of my mailservers, and have them copy the relevent log portions to a central location for further analysis.

I have written something in bash that works, but is slow.

Does anybody know of anything that already exists to accomplish this - or do I need to learn perl and make something up myself?

(I am not putting this on SO, as I am not yet at the point where I want to write any code - just looking for something somebody else is already using)

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1 Answer

I love awk :)

For my logs, which are in the format:

Jul 14 12:49:10 xxxxxx sendmail[31337]: ...........

I would use:

awk '$3 >= "12:00:00" && $3 <= "13:00:00" {print;}' < /var/log/maillog

Presumably you can adapt that as necessary, for instance if you don't split logs by day.

Bonus:

Apache format, which I happen to have kicking around:

xxx.xxx.xxx.xxx - - [01/Jul/2009:03:06:24 -0400] "GET /favicon.ico HTTP/1.1" 200 3638
awk '$4 >= "[01/Jul/2009:03:00:00" && $4 <= "[01/Jul/2009:04:00:00" {print;}' < access_log
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