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Help commandsany_command --help |more Display a brief help on a command (works with most commands). For example, try cp --help |more. "--help" works similar to DOS "/h" switch. The "more" pipe is needed when the output is longer than one screen.
man topic
info topic Display the contents of the info on a particular command. info is a replacement for man pages so it contains the most recent updates to the system documentation. Use <Space> and <BkSpace> to move around or you may get confused. Press "q" to quit. A replacement for the somewhat confusing info browsing system might be pinfo - try if you like it any better.
apropos topic Give me the list of the commands that have something to do with my topic.
whatis topic Give me a short list of commands matching my topic. whatis is similar to apropos (see the command above)--they both use the same database. But whatis searches keywords, while apropos also searches the descriptions of the keywords.
help command Display brief info on a bash (shell) built-in command. Using help with no command prints the list of all bash built-in commands. The shortest list of bash built-in commands would probably include: alias, bg, cd, echo, exit, export, fg, help, history, jobs, kill, logout, pwd, set, source, ulimit, umask, unalias, unset.
kdehelpcenter & (in X-terminal). Browse the whole system help using the graphical KDE help navigator. Normally, KDE help is invoked by pressing the appropriate icon on the KDE control panel. Use gnome-help-browser for the GNOME equivalent. (The older KDE versions used kdehelp& instead of kdehelpcenter&).
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