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    I just verified that your answer is correct on my Linux VM. Commented Feb 4, 2014 at 22:14
  • [ is a link to test as well Commented Feb 5, 2014 at 1:15
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    @RickyBeam in most shells, [ is a shell builtin, and the /usr/bin/[ is rarely used. Commented Feb 5, 2014 at 13:23