How to fast check some archived log file

[isscbta]

Logrotated log files are usually gzip-ed.
Fast way to 'cat' them is:

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zcat /var/log/somelog.2.gz

Fast way to 'grep' them:

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zgrep 'lookingfor' /var/log/somelog.2.gz

If you need another processing command, for example 'exigrep', you can process .gz file through the 'zcat' pipe output:

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zcat /var/log/exim4/mainlog.2.gz | exigrep 'somedomain.com'

To zgrep all *.gz log files:

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zcat /var/log/exim4/mainlog.*.gz | exigrep 'somedomain.com'