usage

	# Short usage description
	fun usage: String is abstract

src/nitpm.nit:31,2--32,30

	redef fun usage do return "nitpm install [package0[=version] [package1 ...]]"

src/nitpm.nit:58,2--78

	redef fun usage do return "nitpm upgrade <package>"

src/nitpm.nit:211,2--52

	redef fun usage do return "nitpm uninstall [-f] <package0>[=version] [package1 ...]"

src/nitpm.nit:249,2--85

	redef fun usage do return "nitpm list"

src/nitpm.nit:310,2--39

	redef fun usage do return "nitpm help [command]"

src/nitpm.nit:349,2--49

abstract fun usage: String