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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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