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INTRO(1)										 INTRO(1)

       intro - introduction to commands

       This section describes publicly accessible commands in alphabetic order.  Certain distinc-
       tions 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.

       (1M)   Commands used primarily for system maintenance.

       The word `local' at the foot of a page means that the command is not intended for  general

       Section (6) for computer games.

       How to get started, in the Introduction.

       Upon termination each command returns two bytes of status, one supplied by the system giv-
       ing 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 lat-
       ter is customarily 0 for successful execution, nonzero to indicate troubles such as  erro-
       neous  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.

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