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  • Thank you. What if I want to put --help after any command? The problem is that --help does not work and I want to get help for any command. Commented Jun 2, 2015 at 19:13
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    --help needs to be explicitly supported by a command for it to work. You should try man followed by the command you're interested in instead; that's more likely to give you the information you're after on Mac OS X. Commented Jun 2, 2015 at 19:15
  • You can install the Gnu versions of the tools. There will be some package you can install to do this. see apple.stackexchange.com/questions/69223/… Commented Jun 2, 2015 at 19:38