If you're going for the minimum in terseness; you can always use a temporary file:
./print_list >/temp/temp.txt; perl filter.pl temp.txt file.txt; rm temp.txt
filter.pl would read from the first file, then use the contents to substitute in the second file:
use strict;
use warnings;
open(my $file1, '<', $ARGV[0]) or die "Can't open $ARGV[0]: $!\n";
my @substitutions = <$file1>;
close($file1);
chomp(@substitutions);
open(my $file2, '<', $ARGV[1]) or die "Can't open $ARGV[1]: $!\n";
while(my $line = <$file2>) {
for my $replace (@substitutions) {
next unless $replace; # skip blanks
$line =~ s/\Q$replace\E/foo/g;
}
print $line;
}
close($file2);
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