INTRO(1)                             BSD                              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, as shown below:

     (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 section 8.

DIAGNOSTICS
     Upon termination, each command returns two bytes of status. One byte is
     supplied by the system giving the cause for termination, and (in the case
     of "normal" termination) one is supplied by the program; see wait(1), and
     exit(2).  The former byte's value is 0 for normal termination, the latter
     is customarily 0 for successful execution, nonzero to indicate troubles
     such as erroneous 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.

SEE ALSO
     domain(1)
     Section 6 (for computer games),
     Getting Started with Domain/OS, and
     Using Your BSD Environment.