Select Code to Download

print "PS file doesn't exist!" unless -e $image_output . ".ps";

    The status returned by the last pipe close, backtick
    (``) command, or system() operator.  Note that this
...
    8), and $? & 255 gives which signal, if any, the
    process died from, and whether there was a core
    dump.  (Mnemonic: similar to sh and ksh.)