getopt

Parse command line arguments.

• Parse optional `verbose`/`version` flags with shorthands:

getopt --options vV --longoptions verbose,version -- --version --verbose

• Add a `--file` option with a required argument with shorthand `-f`:

getopt --options f: --longoptions file: -- --file=somefile

• Add a `--verbose` option with an optional argument with shorthand `-v`, and pass a non-option parameter `arg`:

getopt --options 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 --options rv::s::t: --longoptions verbose,source::,target: -- -v --target target

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