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- getopts optstring name [ arg ... ]
- Checks arg for legal options. If arg is omitted,
- use the positional parameters. A valid option
- argument begins with a + or a -. An argument not
- beginning with a + or a -, or the argument --, ends
- the options. optstring contains the letters that
- getopts recognizes. If a letter is followed by a
- `:', that option is expected to have an argument.
- The options can be separated from the argument by
- blanks.
-
- Each time it is invoked, getopts places the option
- letter it finds in the shell parameter name,
- prepended with a + when arg begins with a +. The
- index of the next arg is stored in OPTIND. The
- option argument, if any, is stored in OPTARG.
-
- A leading : in optstring causes getopts to store
- the letter of the invalid option in OPTARG, and to
- set name to `?' for an unknown option and to `:'
- when a required option is missing. Otherwise,
- getopts prints an error message. The exit status
- is nonzero when there are no more options.
-