intro(1)							      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 ref‐
       erence  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 nor‐
       mal termination, one supplied by the program.   For  more  information,
       see and The former byte is 0 for normal termination; the latter is cus‐
       tomarily 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.

								      intro(1)

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