intro \- introduction to commands
This section describes publicly accessible commands
Certain distinctions of purpose are made in the headings:
Commands of general utility.
Commands for communication with other systems.
Commands used primarily for graphics and computer-aided design.
Commands used primarily for system maintenance.
The word `local' at the foot of a page means that the
command is not intended for general distribution.
The word `UNIX/32V' at the foot of a page means that some or all
of the description applies only to the UNIX/32V system for the
Digital Equipment Corporation VAX-11.
Section (6) for computer games.
Upon termination each command returns two bytes of status,
one supplied by the system giving the cause for
termination, and (in the case of `normal' termination)
one supplied by the program,
The former byte 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.