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1.1       root        1: .\" Copyright (c) 1990 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"     @(#)intro.1    6.2 (Berkeley) 6/24/90
                      6: .\"
                      7: .TH INTRO 1 "April 29, 1985"
                      8: .AT 3
                      9: .SH NAME
                     10: intro \- introduction to commands
                     11: .SH DESCRIPTION
                     12: This section describes publicly accessible commands in alphabetic order.
                     13: Certain distinctions of purpose are made in the headings:
                     14: .TP
                     15: (1)
                     16: Commands of general utility.
                     17: .TP
                     18: (1C)
                     19: Commands for communication with other systems.
                     20: .TP
                     21: (1G)
                     22: Commands used primarily for graphics and computer-aided design.
                     23: .PP
                     24: N.B.: Commands related to system maintenance used to appear in
                     25: section 1 manual pages and were distinguished by (1M) at the top of the
                     26: page.  These manual pages now appear in section 8.
                     27: .SH SEE ALSO
                     28: Section (6) for computer games.
                     29: .PP
                     30: .I How to get started,
                     31: in the Introduction.
                     32: .SH DIAGNOSTICS
                     33: Upon termination each command returns two bytes of status,
                     34: one supplied by the system giving the cause for
                     35: termination, and (in the case of `normal' termination)
                     36: one supplied by the program, see
                     37: .I wait
                     38: and
                     39: .IR exit (2).
                     40: The former byte is 0 for normal termination, the latter
                     41: is customarily 0 for successful execution, nonzero
                     42: to indicate troubles such as erroneous parameters, bad or inaccessible data,
                     43: or other inability to cope with the task at hand.
                     44: It is called variously `exit code', `exit status' or
                     45: `return code', and is described only where special conventions are involved.

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