projects / unix-history / blame
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| 7b089094 WJ |
1 | .\" Copyright (c) 1980, 1990 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| 3 | .\" | |
| 4 | .\" | |
| 5 | .\" Redistribution and use in source and binary forms, with or without | |
| 6 | .\" modification, are permitted provided that the following conditions | |
| 7 | .\" are met: | |
| 8 | .\" 1. Redistributions of source code must retain the above copyright | |
| 9 | .\" notice, this list of conditions and the following disclaimer. | |
| 10 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | .\" notice, this list of conditions and the following disclaimer in the | |
| 12 | .\" documentation and/or other materials provided with the distribution. | |
| 13 | .\" 3. All advertising materials mentioning features or use of this software | |
| 14 | .\" must display the following acknowledgement: | |
| 15 | .\" This product includes software developed by the University of | |
| 16 | .\" California, Berkeley and its contributors. | |
| 17 | .\" 4. Neither the name of the University nor the names of its contributors | |
| 18 | .\" may be used to endorse or promote products derived from this software | |
| 19 | .\" without specific prior written permission. | |
| 20 | .\" | |
| 21 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 25 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | .\" SUCH DAMAGE. | |
| 32 | .\" | |
| 33 | .\" @(#)nice.1 6.7 (Berkeley) 7/24/91 | |
| 34 | .\" | |
| 35 | .Dd July 24, 1991 | |
| 36 | .Dt NICE 1 | |
| 37 | .Os BSD 4 | |
| 38 | .Sh NAME | |
| 39 | .Nm nice | |
| 40 | .Nd execute a Bourne shell command at a low scheduling priority | |
| 41 | .Sh SYNOPSIS | |
| 42 | .Nm nice | |
| 43 | .Op Fl Ns Ar number | |
| 44 | .Ar command | |
| 45 | .Op Ar arguments | |
| 46 | .Sh DESCRIPTION | |
| 47 | .Nm Nice | |
| 48 | runs | |
| 49 | .Ar command | |
| 50 | at a low priority. | |
| 51 | (Think of low and slow). | |
| 52 | If | |
| 53 | .Fl Ns Ar number | |
| 54 | is specified, and if it is greater than or equal | |
| 55 | to 10 (the default), | |
| 56 | .Nm nice | |
| 57 | will execute | |
| 58 | .Ar command | |
| 59 | at that priority. | |
| 60 | The upper bound, or lowest priority that | |
| 61 | .Nm nice | |
| 62 | will run a command is 20. | |
| 63 | The lower bounds or | |
| 64 | higher priorities (integers less than 10) | |
| 65 | can only be requested by the super-user. | |
| 66 | Negative numbers are expressed as | |
| 67 | .Fl - Ns Ar number . | |
| 68 | .Pp | |
| 69 | The returned exit status is the exit value from the | |
| 70 | command executed by | |
| 71 | .Nm nice . | |
| 72 | .Sh SEE ALSO | |
| 73 | .Xr csh 1 , | |
| 74 | .Xr renice 8 | |
| 75 | .Sh HISTORY | |
| 76 | A | |
| 77 | .Nm nice | |
| 78 | command appeared in | |
| 79 | .At v6 . | |
| 80 | .Sh BUGS | |
| 81 | .Nm Nice | |
| 82 | is particular to | |
| 83 | .Xr sh 1 . | |
| 84 | If you use | |
| 85 | .Xr csh 1 , | |
| 86 | then commands executed with ``&'' are automatically immune to hangup | |
| 87 | signals while in the background. | |
| 88 | .Pp | |
| 89 | .Nm Nice | |
| 90 | is built into | |
| 91 | .Xr csh 1 | |
| 92 | with a slightly different syntax than described here. The form | |
| 93 | .Ql nice +10 | |
| 94 | nices to positive nice, and | |
| 95 | .Ql nice \-10 | |
| 96 | can be used | |
| 97 | by the super-user to give a process more of the processor. |