liuxg@liuxg:~$ snapcraft --help
usage: snapcraft [-h] [-v]
                 {init,shell,run,list-plugins,clean,pull,build,stage,snap,assemble,all,version,help}
                 ...

positional arguments:
  {init,shell,run,list-plugins,clean,pull,build,stage,snap,assemble,all,version,help}
    init                start a project
    shell               enter staging environment
    run                 run snap in kvm
    list-plugins        list the available plugins that handle different types
                        of a part
    clean               clean up the environment (to start from scratch)
    pull                get sources
    build               build parts
    stage               put parts into staging area
    snap                put parts into snap area
    assemble (all)      make snap package
    version             show the program's version number and exit
    help                obtain help for plugins and specific topics

optional arguments:
  -h, --help            show this help message and exit
  -v, --version         show the program's version number and exit