perl -e 'for(<*>) { rename($_,"$1.ERR") if /^(\d+_\d+)\.REPT$/}'

Update can make it even shorter like this... 

perl -e 'for(<*>){`mv $_ $1.ERR`if/^(\d+_\d+)\.REPT$/}'

[download]
but I'd go with the first one... :)

                - Ant

In reply to Re: Shorter one-liner? by suaveant
in thread Shorter one-liner? by InfiniteSilence

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