$ mono commands.exe
Use `commands help` for usage.

$ mono commands.exe --help
usage: commands COMMAND [OPTIONS]

Mono.Options.CommandSet sample app.

Global options:
  -v[=VALUE]                 Output verbosity.

Available commands:
        echo                 Echo arguments to the screen
        equinox              Does something with the equinox?
        requires-args        Class-based Command subclass
Commands with spaces are supported:
        has spaces           spaces?!
Nested CommandSets are also supported. They're invoked similarly to commands
with spaces.
        set file type        Does something or other.
        set output           Sets  output location
        completions          Show CommandSet completions

$ mono commands.exe help
usage: commands COMMAND [OPTIONS]

Mono.Options.CommandSet sample app.

Global options:
  -v[=VALUE]                 Output verbosity.

Available commands:
        echo                 Echo arguments to the screen
        equinox              Does something with the equinox?
        requires-args        Class-based Command subclass
Commands with spaces are supported:
        has spaces           spaces?!
Nested CommandSets are also supported. They're invoked similarly to commands
with spaces.
        set file type        Does something or other.
        set output           Sets  output location
        completions          Show CommandSet completions

$ mono commands.exe help --help
Usage: commands COMMAND [OPTIONS]
Use `commands help COMMAND` for help on a specific command.

Available commands:

        completions          Show CommandSet completions
        echo                 Echo arguments to the screen
        equinox              Does something with the equinox?
        has spaces           spaces?!
        requires-args        Class-based Command subclass
        set file type        Does something or other.
        set output           Sets  output location
        help                 Show this message and exit

$ mono commands.exe help echo
--help

$ mono commands.exe echo --help
--help

$ mono commands.exe echo hello, world
hello, world

$ mono commands.exe requires-args
commands: Missing required argument `--name=NAME`.
commands: Use `commands help requires-args` for details.

$ mono commands.exe help requires-args
usage: commands requires-args [OPTIONS]

Class-based Command subclass example.
      --name, -n=name        name of person to greet.
      --help, -h, -?         Show this message and exit.

$ mono commands.exe requires-args --help
usage: commands requires-args [OPTIONS]

Class-based Command subclass example.
      --name, -n=name        name of person to greet.
      --help, -h, -?         Show this message and exit.

$ mono commands.exe requires-args -n World
Hello, World!

$ mono commands.exe invalid-command
commands: Unknown command: invalid-command
commands: Use `commands help` for usage.

$ mono commands.exe help invalid-command
commands: Unknown command: invalid-command
commands: Use `commands help` for usage.

$ mono commands.exe has spaces
spaces, yo! 

$ mono commands.exe set file type whatever
File type set to: whatever

$ mono commands.exe completions
Showing CommandSet completions for prefix '':
	completion: echo
	completion: equinox
	completion: requires-args
	completion: has spaces
	completion: completions
	completion: help
	completion: set file type
	completion: set output

$ mono commands.exe completions e
Showing CommandSet completions for prefix 'e':
	completion: echo
	completion: equinox

$ mono commands.exe completions s
Showing CommandSet completions for prefix 's':
	completion: set file type
	completion: set output

$ mono commands.exe completions s o
Showing CommandSet completions for prefix 's o':
	completion: set output