projects / unix-history / blame
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1 | .\" Copyright (c) 1980 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| 15ea8e48 | 5 | .\" @(#)nohup.1 6.1 (Berkeley) %G% |
| 36b987e5 | 6 | .\" |
| 15ea8e48 | 7 | .TH NICE 1 "" |
| 36b987e5 KM |
8 | .UC 4 |
| 9 | .SH NAME | |
| 10 | nice, nohup \- run a command at low priority (\fIsh\fR only) | |
| 11 | .SH SYNOPSIS | |
| 12 | .B nice | |
| 13 | [ | |
| 14 | .BI \- number | |
| 15 | ] | |
| 16 | command [ arguments ] | |
| 17 | .PP | |
| 18 | .B nohup | |
| 19 | command [ arguments ] | |
| 20 | .SH DESCRIPTION | |
| 21 | .I Nice | |
| 22 | executes | |
| 23 | .I command | |
| 24 | with low scheduling priority. | |
| 25 | If the | |
| 26 | .I number | |
| 27 | argument is present, the priority is incremented (higher | |
| 28 | numbers mean lower priorities) by that amount up to a limit of 20. | |
| 29 | The default | |
| 30 | .I number | |
| 31 | is 10. | |
| 32 | .PP | |
| 33 | The super-user may run commands with | |
| 34 | priority higher than normal | |
| 35 | by using a negative priority, | |
| 36 | e.g. `\-\-10'. | |
| 37 | .PP | |
| 38 | .I Nohup | |
| 39 | executes | |
| 40 | .I command | |
| 41 | immune to hangup and terminate signals from the controlling terminal. | |
| 42 | The priority is incremented by 5. | |
| 43 | .I Nohup | |
| 44 | should be invoked from the shell with `&' in order to | |
| 45 | prevent it from responding to interrupts by or | |
| 46 | stealing the input from | |
| 47 | the next person who logs in on the same terminal. | |
| 48 | The syntax of nice is also different. | |
| 49 | .SH FILES | |
| 50 | nohup.out standard output and standard error file under | |
| 51 | .I nohup | |
| 52 | .SH "SEE ALSO" | |
| d9486865 | 53 | csh(1), setpriority(2), renice(8) |
| 36b987e5 KM |
54 | .SH DIAGNOSTICS |
| 55 | .I Nice | |
| 56 | returns the exit status of the subject command. | |
| 57 | .SH BUGS | |
| 58 | .I Nice | |
| 59 | and | |
| 60 | .I nohup | |
| 61 | are particular to | |
| 62 | .IR sh (1). | |
| 63 | If you use | |
| 64 | .IR csh (1), | |
| 65 | then commands executed with ``&'' are automatically immune to hangup | |
| 66 | signals while in the background. | |
| 67 | There is a builtin command | |
| 68 | .I nohup | |
| 69 | which provides immunity from terminate, but it does not | |
| 70 | redirect output to | |
| 71 | .I nohup.out. | |
| 72 | .PP | |
| 73 | .I Nice | |
| 74 | is built into | |
| 75 | .IR csh (1) | |
| 76 | with a slightly different syntax than described here. The form | |
| 77 | ``nice +10'' nices to positive nice, and ``nice \-10'' can be used | |
| 78 | by the super-user to give a process more of the processor. |