====== Merging logrotate'd files back again ======

As you may already know, ''logrotate'' is an excellent utility to keep the size of your log directory under certain control. However in some cases it may be feasible to "undo" the rotated logs into a single monolithic file. Such is a case when you want to migrate your web server log analization from ''webalizer'' to ''[[http://awstats.sourceforge.net/|awstats]]''. Fortunately there is an utility called ''[[http://mergelog.sourceforge.net/|mergelog]]'' that can this for you for a specific set of files. All I had to do was this small shell wrapper around ''mergelog'' to have a complete log directory (containing many virtual host logfiles from apache) "anti-logrotated" into the current working directory.

<code bash>
#!/bin/bash

if [ ! -d "$1" ]; then
        echo "usage: $0 [directory]"
        exit -1
fi

ls -1 "$1" | sed 's/[.]gz$//g' | sed 's/[.][0-9]*$//g' | sort | uniq | while read logname; do

        echo "merging files of ${logname}..."
        zmergelog "$1/${logname}"* > "${logname}"

done
</code>

{{tag>bash util mergelog logrotate}}

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