|Linux & Unix Commands - Search Man Pages
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.
(1M) Commands used primarily for system maintenance.
The word `local' at the foot of a page means that the command is not intended for general
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.
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