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  • The best way to find out what is to run it. The best way to find out why is to read the documentation of the three commands involved. Commented Jan 7, 2011 at 18:34
  • 5
    Although, if you truly haven't seen the commands before, it might be a better idea to read the documentation first. One does not want to get into the habit of simply running any command they come across. Commented Jan 7, 2011 at 20:04