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    #!/usr/bin/perl -w
    
    ...
    if( $opt_h ) { $height = $opt_h ; }
    
    print "$height:$width\n";
    
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    Global symbol "$opt_w" requires explicit package name at ./adjust.pl l
    +ine 14.
    
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    #!/usr/bin/perl -w
    
    ...
    if( $opt_h ) { $height = $opt_h ; }
    
    print "$width:$height\n";
    
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    $ ./my.pl -w 1000 -h 9
    
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    500:500