BSD 2.11 - man page for intro (bsd section 1)
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intro - introduction to commands
This section describes publicly accessible commands in alphabetic order. Certain distinc-
tions 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.
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 sec-
Section (6) for computer games.
How to get started, in the Introduction.
Upon termination each command returns two bytes of status, one supplied by the system giv-
ing the cause for termination, and (in the case of `normal' termination) one supplied by
the program, see wait and exit(2). The former byte is 0 for normal termination, the lat-
ter is customarily 0 for successful execution, nonzero to indicate troubles such as erro-
neous 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.
7th Edition April 29, 1985 INTRO(1)
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