ultrix man page for intro

intro(1)						      General Commands 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.

       (1int)	 Commands used for internationalization.  For more information see

       (1mh)	 Commands specific to the Message Handler.

       (1ncs)	 Commands used for NCS (Network Computing System).

       (1sh5)	 Commands interpreted by the sh5 (System V Release 2) shell.

       (1yp)	 Commands specific to the Yellow Pages (YP) service.

       Commands  related  to system maintenance used to appear in section 1 reference pages and were distinguished by (1m) at the top of the page.
       These reference pages now appear in section 8.

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.  For more information, see and The former byte is 0 for normal termination; the latter is
       customarily 0 for successful execution.	A nonzero status indicates a problem such as erroneous parameters, or bad  or  inaccessible  data.
       It is called variously exit code, exit status, or return code, and is described only where special conventions are involved.

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