Word:

command line option

(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.
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Comitiva
Comity
comity of nations
comm mode
Comma
comma bacillus
comma butterfly
comma separated values
Command
Command Control Processor
command guidance
command interpreter
command key
command language
command line
command line interface
-- command line option --
command module
command overhead
command post
command processing overhead
command processing overhead time
command prompt
command-line interpreter
Commandable
Commandant
Commandatory
Commandeer
Commander
commander in chief
Commandership
Commandery
Commanding
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