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$ ls -l input.txt
ls: input.txt: No such file or directory
...

$ ls -l input.txt
-rw-r--r--  1 ken  staff  16393 12 Mar 15:34 input.txt

$ perl -e '
    use strict;
...
    my $output_file = q{output.txt};
    my $return_value = system "ls -l >> $output_file";
'