Commit | Line | Data |
---|---|---|
15637ed4 RG |
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. |