Display information on how to use TOPIC, which may be a command, webpage, or setting. Webpage names begin with "/". If TOPIC is omitted, a list of topics is returned. If there is an extra argument after TOPIC, it is the name of a subcommand, in which case only the help text for that one subcommand is shown.

The following options can be used when TOPIC is omitted:

-a|--all

List both common and auxiliary commands

-e|--everything

List all help on all topics

-f|--full

List full set of commands (including auxiliary and unsupported "test" commands), options, settings, and web pages

-o|--options

List command-line options common to all commands

-s|--setting

List setting names

-t|--test

List unsupported "test" commands

-v|--verbose

List both names and help text

-x|--aux

List only auxiliary commands

-w|--www

List all web pages

These options can be used when TOPIC is present:

-c|--commands

Restrict TOPIC search to commands

-h|--html

Format output as HTML rather than plain text

-o|--options

Show command-line options for TOPIC

--raw

Output raw, unformatted help text

-u|--usage

Show a succinct usage summary, not full help text

See also: usage, options, search with the -h option