projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 74375d81 | 1 | .\" @(#)intro.1 6.1 (Berkeley) %G% |
| af566d2f | 2 | .\" |
| 74375d81 | 3 | .TH INTRO 1 "" |
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4 | .AT 3 |
| 5 | .SH NAME | |
| 6 | intro \- introduction to commands | |
| 7 | .SH DESCRIPTION | |
| 7850f786 | 8 | This section describes publicly accessible commands in alphabetic order. |
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9 | Certain distinctions of purpose are made in the headings: |
| 10 | .TP | |
| 11 | (1) | |
| 12 | Commands of general utility. | |
| 13 | .TP | |
| 14 | (1C) | |
| 15 | Commands for communication with other systems. | |
| 16 | .TP | |
| 17 | (1G) | |
| 18 | Commands used primarily for graphics and computer-aided design. | |
| 19 | .PP | |
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20 | N.B.: Commands related to system maintenance used to appear in |
| 21 | section 1 manual pages and were distinguished by (1M) at the top of the | |
| 22 | page. These manual pages now appear in section 8. | |
| af566d2f | 23 | .SH SEE ALSO |
| 7850f786 | 24 | Section (6) for computer games. |
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25 | .PP |
| 26 | .I How to get started, | |
| 27 | in the Introduction. | |
| 28 | .SH DIAGNOSTICS | |
| 29 | Upon termination each command returns two bytes of status, | |
| 30 | one supplied by the system giving the cause for | |
| 31 | termination, and (in the case of `normal' termination) | |
| 7850f786 | 32 | one supplied by the program, see |
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33 | .I wait |
| 34 | and | |
| 35 | .IR exit (2). | |
| 36 | The former byte is 0 for normal termination, the latter | |
| 37 | is customarily 0 for successful execution, nonzero | |
| 38 | to indicate troubles such as erroneous parameters, bad or inaccessible data, | |
| 39 | or other inability to cope with the task at hand. | |
| 40 | It is called variously `exit code', `exit status' or | |
| 7850f786 | 41 | `return code', and is described only where special conventions are involved. |