getopts is the POSIX shell built-in for parsing command-line options in bash and other shells, documented in the GNU Project's manuals 1. For a structured alternative, Docopt generates option parsers from a usage description 3, and Bashly generates feature-rich bash command-line tools with argument parsing from a YAML file 10.

1. 1

   GNU Project Getoptsgnu.orgwebsite read, tools not yet checked

   GNU documentation hub that points to the GNU manuals, where the shell getopts built-in is documented.

   WebsiteDocs

2. 2

   Docoptdocopt.orgverified and signed

   Describes a command-line interface in a formal usage message and parses options from it, as an alternative to hand-written getopts loops.

   Website

   for agents: getopt · optparse · parsing

3. 3

   Bashlybashly.devwebsite read, tools not yet checked

   Generates bash command-line tools from a YAML description of commands, flags and arguments, handling argument parsing and usage texts.

   Website