1INTRO(1)                    General Commands Manual                   INTRO(1)
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NAME

6       intro - introduction to commands
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DESCRIPTION

9       This  section  describes  publicly  accessible  commands  in alphabetic
10       order.  Certain distinctions of purpose are made in the headings:
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12       (1)    Commands of general utility.
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14       (1C)   Commands for communication with other systems.
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16       (1G)   Commands used primarily for graphics and computer-aided design.
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18       N.B.: Commands related to system maintenance used to appear in  section
19       1  manual  pages and were distinguished by (1M) at the top of the page.
20       These manual pages now appear in section 8.
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SEE ALSO

23       Section (6) for computer games.
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25       How to get started, in the Introduction.
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DIAGNOSTICS

28       Upon termination each command returns two bytes of status, one supplied
29       by  the  system  giving  the cause for termination, and (in the case of
30       `normal' termination)  one  supplied  by  the  program,  see  wait  and
31       exit(2).   The  former  byte is 0 for normal termination, the latter is
32       customarily 0 for successful execution, nonzero  to  indicate  troubles
33       such  as  erroneous  parameters,  bad  or  inaccessible  data, or other
34       inability to cope with the task at hand.  It is called variously  `exit
35       code', `exit status' or `return code', and is described only where spe‐
36       cial conventions are involved.
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407th Edition                     April 29, 1985                        INTRO(1)