[1] : The Free On-line Dictionary of Computing (27 SEP 03)

command line option
     
         or "option", "flag", "switch", "option switch" an
        argument to a command that modifies its function rather than
        providing data.  options generally start with "-" in unix or
        "/" in ms-dos.  this is usually followed by a single letter
        or occasionally a digit.
     
        some commands require each option to be a separate argument,
        introduced by a new "-" or "/", others allow multiple option
        letters to be concatenated into a single argument with a
        single "-" or "/", e.g. "ls -al".  a few unix commands
        e.g. ar, tar allow the "-" to be omitted.  some options
        may or must be followed by a value, e.g. "cc prog.c -o prog",
        sometimes with and sometimes without an intervening space.
     
        getopt and getopts are commands for parsing command line
        options.  there is also a c library routine called getopt
        for the same purpose.
     
        1996-12-11
     
     
see also:
unix ms-dos ar tar getopt getopts 
c 

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