http://www.perlmonks.org?node_id=800815


in reply to piping to lp is broken after perl upgrade

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: $!";

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

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Re^2: piping to lp is broken after perl upgrade
by myuserid7 (Scribe) on Oct 12, 2009 at 23:26 UTC
    I got excited when I saw your close - I thought for sure the open handle was causing the grief.

    Added the error checking. Nothing.

    Something is foobar here and I am not sure it is perl. Even from the command line... 

    cat foo.ps | /usr/bin/lp -o nobanner

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    prints the postscript code while... 
    /usr/bin/lp -o nobanner foo.ps

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    Prints the postscript document. So I really can't expect my perl script to work as written.
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