Erm... sure 'yes we can'. But more fun than golf (and more valuable to the blogger) would be: count the errors. Arbitrary section picked at a glance:

sub fill_hash {
# get filename
print "Enter 'ls' or a filename to scan: ";
my $file_name = shift || ;
while ($file_name =~ m/^ls/) {
system("$file_name");
print "\nEnter 'ls' or a filename to scan: ";
$file_name = ;
}
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WTF? for sure,

syntax error at foo line xx, near "|| ;"
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Ah well... golf, then :-)

map{$s{$_}++}/./gfor<>
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