Some None of the other solutions will not correctly handle a list of files either (only the ones using $. will). And this one is easily extended to do so:
perl -MTie::File -e 'tie(@file, 'Tie::File', $_) and splice @file, 31, 1 for @ARGV' file1 file2 file3
Update: zigdon is right. I should have tested.
Makeshifts last the longest.
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