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Command Line Arguments

• The standard library contains the Arg module, which has a simple syntax for defining command line arguments. However, it uses mutable state for arguments, and doesn’t have a built-in way to handle things such as sub-arguments, or argument aliases (long and short) for the same command, though these things can be done.
• Cmdliner is a declarative approach to laying out command-line arguments. The library uses combinators to build up the desired arguments.
  • Cmdliner cheat sheet
• ez_cmdliner: Simpler interface on top of Cmdliner.
• BOS - Basic OS Interaction is a general OS abstraction library which also contains a command line argument module (BOS.OS.Arg).
• Jane Street’s Core standard library contains the Command module, which takes a similar approach to Cmdliner.
• Minicli is a self-described minimalist library for command line parsing.
• Quick-and-dirty pure command-line arguments in OCaml (using the standard Library’s Arg module)