<Software> (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)

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