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man is the
abbreviation of ``manual'', and info is self explanatory.
Assuming the terminal is set up correctly, both programs are full-screen
capable.
man is the older online help program. Help files intended for
man are flat, which can make it quite difficult to read.
info, on the other hand, is hierarchical. You can position the
cursor on a ``hyperlink'', press ENTER, and go to a different page.
If you want to look up how to use a command, I'd try man first.
Usually, if an info page is available, the man page will
say so.
With man, use up, down, page-up, page-down, home and end to navigate
through a ``man page''. To quit man, use the q key.
With info, use up, down, page-up, page-down to navigate. Use
ctrl-H to display the help screen. In the help screen C-x means
ctrl-x. To quit info, use the q key.