Invoking cmp

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Invoking `cmp'
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   The `cmp' command compares two files, and if they differ, tells the
first byte and line number where they differ.  Its arguments are as
follows:

     cmp OPTIONS... FROM-FILE [TO-FILE]

   The file name `-' is always the standard input.  `cmp' also uses the
standard input if one file name is omitted.

   An exit status of 0 means no differences were found, 1 means some
differences were found, and 2 means trouble.

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