help

show help for a given topic or a help overview

With no arguments, print a list of commands with short help messages.

Given a topic, extension, or command name, print help for that topic.

Returns 0 if successful.

arguments

shortname	fullname	description
`-e`	`--extension`	show help for extensions
`-c`	`--command`	show help for commands
`-k`	`--keyword`	show topics matching keyword
`-s`	`--system`	show help for specific platform(s)