Identify missing parts in a sequence of split files in the current dir eg file.1, file.03, file.005 etc => prints 2 and 4 I'm sure this could be made tighter, I'm still a Perl newbie.
perl -e 'for $c (sort {$a<=>$b} grep(s/^.+?([0-9]+)$/$1/, `ls *[0-9]`)){ ++$n == $c || print grep(s/$/\n/, $n...$c-1) ; $n=$c }'

In reply to one-line split file sequence checker by wdef2

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