Unix Help system
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Public domain
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__man__ - format and display the on-line manual pages

    man 1 expand
    man -a open
    man bash | col -b > bash.txt
    man -t bash > bash.ps
    man -t bash | ps2pdf - > bash.pdf

__whatis__ - search the whatis database for complete words. 

    whatis open

__apropos__ - search the whatis database for strings

    apropos "create a file"
    man -k  "create a file"

__whereis__ - locate the binary, source, and manual page files for a command

    whereis expand

__which__ - shows the full path of (shell) commands.

    which ls

__type__ - indicate how each name would be interpreted if used as a command name


    $ type expand
    expand is /usr/bin/expand

    $ type -a ls
    ls is aliased to `/bin/ls $LS_OPTIONS'
    ls is /usr/bin/ls
    ls is /bin/ls

    $ type -t ls
    alias

    $ type -t type
    builtin

__info__ - read Info documents

    info bash
    info info
    info gcc
    info libc
    info gdb
    info emacs
    info "(standards)User Interfaces"
    info coreutils 'printenv invocation'


Document directoris

    /usr/doc/
    /usr/doc/Linux-FAQs/
    /usr/doc/Linux-HOWTOs
    
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_BY: Pejman Moghadam_  
_TAG: man, whatis, apropos, whereis, which, type_  
_DATE: 2011-05-28 08:10:08_