|(software)||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.