intro - Introduction to commands
Section 1 describes the commands available for all Tru64 UNIX users.
Some reference pages in this section may contain suffixes to allow their
files to exist with those of other reference pages having the same base
name and section number. When used, suffixes are made up of one to four
letters. See the man(1) reference page for more information on suffixes.
Commands related to system maintenance appear in Section 8.
On termination, each command returns two bytes of status, one supplied by
the system giving the cause for termination and, in the case of normal ter-
mination, one supplied by the program. For more information, see exit(2).
The first byte is 0 for normal termination; the second byte is customarily
0 for successful execution. A nonzero status indicates a problem, such as
erroneous parameters, or bad or inaccessible data. The status value is
called variously exit code, exit status, or return code, and is described
explicitly on reference pages only when special conventions apply.