One Day One Command :-
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info - Read documentation in Info format.
Summary:
Apart from Man pages, some commands comes with a detail manual pages,
called info pages, which is in info format. This info command provides
Menu, Search, Corss-Ref and many other facilities.
Examples:
$ info -- List all info pages available in the system.
$ pinfo -- Curses based lynx-style info browser.
$ info emacs -- Show Emacs info page. (See man emacs, to feel the
difference)
Read: info info, info pinfo
Bye :)
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Bharathi S