Command line option

<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.

< Previous Terms Terms Containing command line option Next Terms >
Command Control Processor
command interpreter
command key
command line interface
command-line interpreter
command line option
comma separated values
comment out
commercial at