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