Re^3: Appending string to all lines

[hippo]

That should indeed generate syntax errors because perl is not a valid function name in Perl. You can't just type random shell commands into perl and expect it to process them like your shell would - they are completely different systems.

#!/usr/bin/perl -n
use strict;
use warnings;

chomp;
printf "%sUF,A,Y,9,U\n", $_;

See perlrun for how to use flags like -n and perlfunc for a list of all the functions available. Note that I've made no attempt to optimise your algorithm here.