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  1. or download this
    'if (-d "/usr") { print 'yes';}'
  2. or download this
    $ perl -le'print "[$_]" for @ARGV' -- \
    perl -le 'if (-d "/usr") { print 'yes';}'
[perl]
[-le]
[if (-d "/usr") { print yes;}]
  3. or download this
    'if (-d "/usr") { print '\''yes\''';}'
  4. or download this
    $ perl -le'print "[$_]" for @ARGV' -- \
    perl -le 'if (-d "/usr") { print '\''yes'\'';}'
[perl]
[-le]
[if (-d "/usr") { print 'yes';}]