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Comment out different ranges of values in a file - Perl

Your %hash should actually hold keys (numbers) which you want to prefix with #


use warnings;
use strict;

# my %hash = (2,4,7,8);
my ($rangefile) = @ARGV;

open (my $RANGE, "<", $rangefile) or die
"Couldn't open $rangefile: $!
my %hash;
while ( <$RANGE> ) {
        my ($begin, $end) = split;
        @hash{$begin .. $end} = ();
close $RANGE;

while (<DATA>) {
        my ($num) = /^(d+)/ or next;
        s/^/#/ if exists $hash{$num};


Categories : Perl

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