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#!/usr/bin/perl
use strict;
...
        print $out $_;
    }
}

#!/usr/bin/perl
use strict;
...
my %out = map { $_ => undef } qw( op0 op1 op2 op3 );
( open $out{ $_ }, '>', $_ or die "can't: $!\n" ) for keys %out;
while ( $line = <> ) { print $_ $line for values %out; }

#!/usr/bin/perl
use strict; use warnings;
...
my %out = map { $_ => undef } @out;
for ( @out ) { open $out{ $_ }, '>', $_ || die "Can't: $!\n" }
while ( my $l = <> ) { print $_ $l for values %out }