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You should check if open was successful, and also if close was:

open my $output, '|-', $PRINT_CMD or die "Can't open pipe to $PRINT_CMD: $!"; print $output $prolog; ... close $output or warn "Error while closing pipe to $PRINT_CMD: $!";

Maybe that'll give you some clue about what's wrong.

Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re: piping to lp is broken after perl upgrade by moritz
in thread piping to lp is broken after perl upgrade by myuserid7

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