| 1 | .TH INTRO 1 |
| 2 | .UC 4 |
| 3 | .SH NAME |
| 4 | intro \- introduction to commands |
| 5 | .SH DESCRIPTION |
| 6 | This section describes publicly accessible commands |
| 7 | in alphabetic order. |
| 8 | Certain distinctions of purpose are made in the headings: |
| 9 | .TP |
| 10 | (1) |
| 11 | Commands of general utility. |
| 12 | .TP |
| 13 | (1C) |
| 14 | Commands for communication with other systems. |
| 15 | .TP |
| 16 | (1G) |
| 17 | Commands used primarily for graphics and computer-aided design. |
| 18 | .PP |
| 19 | N.B.: Commands related to system maintenance, which appeared in |
| 20 | section 1, distinguished by (1M), in previous versions of the manual |
| 21 | have been moved to section 8, as they are of little interest to most |
| 22 | users. |
| 23 | .PP |
| 24 | The word `VAX-11' at the foot of a page means that some or all |
| 25 | of the description applies only to the implementation for the |
| 26 | Digital Equipment Corporation VAX-11. |
| 27 | Pages added or changed between the distribution of UNIX/32V and the |
| 28 | Berkeley Distribution indicate `3rd Berkeley Distribution' or |
| 29 | `4th Berkeley Distribution' at the lower left, as appropriate. |
| 30 | .SH SEE ALSO |
| 31 | Section (6) for computer games, section (8) for system maintenance |
| 32 | commands. |
| 33 | .PP |
| 34 | .I How to get started, |
| 35 | in the Introduction. |
| 36 | .SH DIAGNOSTICS |
| 37 | Upon termination each command returns two bytes of status, |
| 38 | one supplied by the system giving the cause for |
| 39 | termination, and (in the case of `normal' termination) |
| 40 | one supplied by the program, |
| 41 | see |
| 42 | .I wait |
| 43 | and |
| 44 | .IR exit (2). |
| 45 | The former byte is 0 for normal termination, the latter |
| 46 | is customarily 0 for successful execution, nonzero |
| 47 | to indicate troubles such as erroneous parameters, bad or inaccessible data, |
| 48 | or other inability to cope with the task at hand. |
| 49 | It is called variously `exit code', `exit status' or |
| 50 | `return code', and is described only where special |
| 51 | conventions are involved. |