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Perl
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#!/usr/bin/perl
 
use strict;
use warnings;
 
if (scalar @ARGV == 0 or $ARGV[0] eq '-h' or $ARGV[0] eq '-help') {
die "Usage: $0 pattern [file...]\n";
}
 
my $pattern = shift;
my $start = "\e[1m";
my $end = "\e[0m";
 
while (<>) {
s/$pattern/$start$&$end/g;
print;
}

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