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1.1       root        1: .TH INTRO 1 "18 January 1983"
                      2: .SH NAME
                      3: intro \- introduction to commands
                      4: .SH DESCRIPTION
                      5: This section describes publicly accessible commands in alphabetic order.
                      6: Certain distinctions of purpose are made in the headings:
                      7: .TP
                      8: (1)
                      9: Commands of general utility.
                     10: .TP
                     11: (1C)
                     12: Commands for communication with other systems.
                     13: .TP
                     14: (1G)
                     15: Commands used primarily for graphics and computer-aided design.
                     16: .PP
                     17: N.B.: Commands related to system maintenance used to appear in
                     18: section 1 manual pages and were distinguished by (1M) at the top of the
                     19: page.  These manual pages now appear in section 8.
                     20: .SH SEE ALSO
                     21: Section (6) for computer games.
                     22: .PP
                     23: .I How to get started,
                     24: in the Introduction.
                     25: .SH DIAGNOSTICS
                     26: Upon termination each command returns two bytes of status,
                     27: one supplied by the system giving the cause for
                     28: termination, and (in the case of `normal' termination)
                     29: one supplied by the program, see
                     30: .I wait
                     31: and
                     32: .IR exit (2).
                     33: The former byte is 0 for normal termination, the latter
                     34: is customarily 0 for successful execution, nonzero
                     35: to indicate troubles such as erroneous parameters, bad or inaccessible data,
                     36: or other inability to cope with the task at hand.
                     37: It is called variously `exit code', `exit status' or
                     38: `return code', and is described only where special conventions are involved.

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