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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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