Libraries for advanced parsing of command-line arguments

Functionaly provided by standard library package flag is limited.

There is a number of libraries that provide more functionality for command line parsing:

• argparse - Command line argument parser inspired by Python’s argparse module.
• cli - Feature-rich and easy to use command-line package based on golang struct tags.
• cli - Simple and complete API for building command line interfaces in Go.
• cli-init - The easy way to start building Golang command line applications.
• climax - Alternative CLI with “human face”, in spirit of Go command.
• cobra - Commander for modern Go CLI interactions.
• commandeer - Dev-friendly CLI apps: sets up flags, defaults, and usage based on struct fields and tags.
• docopt.go - Command-line arguments parser that will make you smile.
• flag - Simple but powerful command line option parsing library for Go supporting subcommand.
• go-arg - Struct-based argument parsing in Go.
• go-flags - go command line option parser.
• gocmd - Go library for building command line applications.
• kingpin - Command line and flag parser supporting sub commands.
• mitchellh/cli - Go library for implementing command-line interfaces.
• mow.cli - Go library for building CLI applications with sophisticated flag and argument parsing and validation.
• pflag - Drop-in replacement for Go’s flag package, implementing POSIX/GNU-style –flags.
• sflags - Struct based flags generator for flag, urfave/cli, pflag, cobra, kingpin and other libraries.
• strumt - Library to create prompt chain.
• ukautz/clif - Small command line interface framework.
• urfave/cli - Simple, fast, and fun package for building command line apps in Go (formerly codegangsta/cli).