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getopt: add page (#6990)

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Janek 2021-10-23 20:36:21 +02:00 • committed by GitHub
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# getopt
> Parse command line arguments.
> More information: <https://www.gnu.org/software/libc/manual/html_node/Getopt.html>.
- Parse optional `verbose`/`version` flags with shorthands:
`getopt -o vV --longoptions verbose,version -- --version --verbose`
- Add a `--file` option with a required argument with shorthand `-f`:
`getopt -o f: --longoptions file: -- --file=somefile`
- Add a `--verbose` option with an optional argument with shorthand `-v`, and pass a non-option parameter `arg`:
`getopt -o v:: --longoptions verbose:: -- --verbose arg`
- Accept a `-r` and `--verbose` flag, a `--accept` option with an optional argument and add a `--target` with a required argument option with shorthands:
`getopt -o rv::s::t: --longoptions verbose,source::,target: -- -v --target target`