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Does getopts not accept optional arguments for an option using double colons (e.g. using shortopts="t::")?

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  • For multi-word arguments, use quotes: ./script.sh -t "three word argument" and remember that it is then one string with spaces in variable OPTARG that might need splitting depending on your use case.
    – FelixJN
    Dec 19, 2021 at 21:03
  • getopt does; getopts with an s does not. Beware options with optional arguments - how will the system decide whether a following argument is the optional value, or a new, separate argument? That's probably why getopts skipped it. I consider it a bug, not a feature. Oct 6, 2022 at 13:50
  • @PaulHodges, the way the various getopt() implementations treat optional option-args is by taking everything after the option character in the same command line argument as the option-arg. So if -a takes an optional option-arg, -abc is -a with the opt-arg bc, while -a bc is -a without an opt-arg (or with the empty string), plus bc as a regular non-option argument. That gives a well-defined result and allows passing arbitrary strings as optional opt-args, but annoyingly different from how mandatory opt-args work, with both -abc and -a bc meaning -a with the opt-arg bc.
    – ilkkachu
    Mar 8, 2023 at 21:06

1 Answer 1

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No, Bash's getopts doesn't support optional option-arguments.

There's nothing in the manual to indicate that it would, it only says

if a character is followed by a colon, the option is expected to have an argument, which should be separated from it by whitespace.

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