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  1. or download this
    # FALSE-on-0        (bad)
% perl -e 'while($x = 0)       {sleep print "Hello\n"}'
% perl -e 'while(($x = 0))     {sleep print "Hello\n"}'
% perl -e 'while((($x = 0)))   {sleep print "Hello\n"}'
% perl -e 'while(((($x = 0)))) {sleep print "Hello\n"}'
  2. or download this
    # TRUE-on-0         (good)
% perl -e 'while(($x) = 0  ) {sleep print "Hello\n"}'

# but FALSE-on-()   (good)
% perl -e 'while(($x) = () ) {sleep print "Hello\n"}'