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1.1 ! root 1: .\" @(#)intro.1 6.1 (Berkeley) 4/29/85 ! 2: .\" ! 3: .TH INTRO 1 "April 29, 1985" ! 4: .AT 3 ! 5: .SH NAME ! 6: intro \- introduction to commands ! 7: .SH DESCRIPTION ! 8: This section describes publicly accessible commands in alphabetic order. ! 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 ! 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. ! 23: .SH SEE ALSO ! 24: Section (6) for computer games. ! 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) ! 32: one supplied by the program, see ! 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 ! 41: `return code', and is described only where special conventions are involved.
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