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$ perl -MO=Deparse -pe 's/^(?:L\d+|DETAIL|SPACE|SUMMARY),//'
LINE: while (defined($_ = <ARGV>)) {
...
continue {
    die "-p destination: $!\n" unless print $_;
}

while (<>) {
    s/^(?:L\d+|DETAIL|SPACE|SUMMARY),//;
    print;
}

#!/usr/bin/env perl
use warnings;
...
}
close $ofh;
close $ifh;