It would help if your code was properly formatted.
Anyway, to use 'say' you need to
for "my $debug" declaration you probably meant
my $debug = $ARGV;
'ids' need to be declared as a hash, not a scalar
while loop needs to read from the file handle that you opened instead of checking the truth value of $filename variable which causes infinite loop if $filename is anything other than 0 or empty string
'print say' at the end doesn't really do any good
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