list of available commands. When called with the name of a command
as first argument, it prints the description of this command.
[/description]
+ m4_include(`long-help.m4')
[subcommand fg]
purpose = enter command mode
[description]
Mainly useful for debugging.
[/description]
+
+[subcommand quit]
+ purpose = exit para_play
+ [description]
+ Pressing CTRL+D causes EOF on stdin which also exits
+ para_play.
+ [/description]