CLI subcommands with precise help output

Introduction

Different ways to create subcommands like in hg or svn with the exact command line interface and help output as shown in Remarks section.

http://stackoverflow.com/documentation/python/1382/parsing-command-line-arguments covers broader topic of arguments parsing.

Remarks

Different ways to create subcommands like in hg or svn with the command line interface shown in the help message:

usage: sub <command>

commands:

  status -  show status
  list   -  print list