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If you’re like me and most humans, the Nagios logfile timestamp (a unix timestamp) isn’t terribly useful when trying to grep through the logs and correlate events:

# head -2 nagios.log
[1350360000] LOG ROTATION: DAILY
[1350360000] LOG VERSION: 2.0

Here’s a nifty Perl one-liner that you can pipe your logs through:

perl -pe 's/(\\d+)/localtime($1)/e'  

to get nicer output like:

# head -2 nagios.log
[Tue Oct 16 00:00:00 2012] LOG ROTATION: DAILY
[Tue Oct 16 00:00:00 2012] LOG VERSION: 2.0

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