# 2.11BSD#431 - /usr/man/cat1/intro.0

    INTRO(1)	    UNIX Programmer's Manual		 INTRO(1)

    NAME
         intro - introduction to commands

    DESCRIPTION
         This section describes publicly accessible commands in
         alphabetic order.	Certain distinctions of purpose are made
         in the headings:

         (1)  Commands of general utility.

         (1C) Commands for communication with other systems.

         (1G) Commands used primarily for graphics and computer-aided
    	  design.

         N.B.: Commands related to system maintenance used to appear
         in section 1 manual pages and were distinguished by (1M) at
         the top of the page.  These manual pages now appear in sec-
         tion 8.

    SEE ALSO
         Section (6) for computer games.

         How to get started, in the Introduction.

    DIAGNOSTICS
         Upon termination each command returns two bytes of status,
         one supplied by the system giving the cause for termination,
         and (in the case of `normal' termination) one supplied by
         the program, see wait and exit(2).  The former byte is 0 for
         normal termination, the latter is customarily 0 for success-
         ful execution, nonzero to indicate troubles such as errone-
         ous parameters, bad or inaccessible data, or other inability
         to cope with the task at hand.  It is called variously `exit
         code', `exit status' or `return code', and is described only
         where special conventions are involved.

    Printed 11/26/99	 April 29, 1985                         1

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