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getopts -- Command Parse command-line options getopts optstring name [ opt ] The command getopts parses a command's options and check their legality. optstring must contain the options letters that the command using getopts will recognize. If a letter is followed by a colon `:', that option must have an argument that is separated from it by whitespace. Each time it is invoked, getopts places the next option into the shell variable name and the index of the next argument to be processed into the shell variable OPTIND, which is initialized by default to one. When an option requires an argument, getopts copies it into the shell variable OPTARG. If getopts encounters an error, it initializes variable name to ?. When it encounters the end of the options, getopts exits with non-zero status. The special option ``--'' can be used to delineate the end of options. Example The following example processes a command that takes options a, b, and o; the last option requires an argument: while getopts abo: c do case $c in a|b) FLAGS=$FLAGS$c;; o) OARG=$OPTARG;; \?) echo $USAGE 1>&2 exit 2;; esac done shift OPTIND-1 This code will accept any of the following as equivalent: cmd -a -b -o"xxx z yy" file cmd -a -b -o"xxx z yy" -- file cmd -ab -o"xxx z yy" file cmd -ab -o"xxx z yy" -- file Note that no space is required between -o and its argument. See Also commands, getopt(), ksh