1.\" Copyright (c) 1980, 1990, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
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25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" @(#)nice.1 8.1 (Berkeley) 6/6/93
33.\" $FreeBSD: head/usr.bin/nice/nice.1 50477 1999-08-28 01:08:13Z peter $
34.\"
35.Dd June 6, 1993
36.Dt NICE 1
37.Os BSD 4
38.Sh NAME
39.Nm nice
40.Nd execute a command at a low scheduling priority
41.Sh SYNOPSIS
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68current process priority can only requested by the
69super-user.
70Negative numbers are expressed as
71.Fl - Ns Ar number .
72.Pp
73The returned exit status is the exit value from the
74command executed by
75.Nm nice .
76.Sh EXAMPLES
77.Pp
78$ nice -5 date
79.Pp
80Execute command
81.Sq date
82at priority 5 assuming the priority of the
83shell is 0.
84.Pp
85# nice -16 nice --35 date
86.Pp
87Execute command
88.Sq date
89at priority -19 assuming the priority of the
90shell is 0 and you are the super-user.
91.Sh SEE ALSO
92.Xr csh 1 ,
93.Xr idprio 1 ,
94.Xr rtprio 1 ,
95.Xr getpriority 2 ,
96.Xr setpriority 2 ,
97.Xr renice 8
98.Sh HISTORY
99A
100.Nm
101command appeared in
102.At v6 .
103.Sh BUGS
104.Nm Nice
105is particular to
106.Xr sh 1 .
107If you use
108.Xr csh 1 ,
109then commands executed with ``&'' are automatically immune to hangup
110signals while in the background.
111.Pp
112.Nm Nice
113is built into
114.Xr csh 1
115with a slightly different syntax than described here. The form
116.Ql nice +10
117nices to positive nice, and
118.Ql nice \-10
119can be used
120by the super-user to give a process more of the processor.
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
--- 16 unchanged lines hidden (view full) ---
25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" @(#)nice.1 8.1 (Berkeley) 6/6/93
33.\" $FreeBSD: head/usr.bin/nice/nice.1 50477 1999-08-28 01:08:13Z peter $
34.\"
35.Dd June 6, 1993
36.Dt NICE 1
37.Os BSD 4
38.Sh NAME
39.Nm nice
40.Nd execute a command at a low scheduling priority
41.Sh SYNOPSIS
--- 26 unchanged lines hidden (view full) ---
68current process priority can only requested by the
69super-user.
70Negative numbers are expressed as
71.Fl - Ns Ar number .
72.Pp
73The returned exit status is the exit value from the
74command executed by
75.Nm nice .
76.Sh EXAMPLES
77.Pp
78$ nice -5 date
79.Pp
80Execute command
81.Sq date
82at priority 5 assuming the priority of the
83shell is 0.
84.Pp
85# nice -16 nice --35 date
86.Pp
87Execute command
88.Sq date
89at priority -19 assuming the priority of the
90shell is 0 and you are the super-user.
91.Sh SEE ALSO
92.Xr csh 1 ,
93.Xr idprio 1 ,
94.Xr rtprio 1 ,
95.Xr getpriority 2 ,
96.Xr setpriority 2 ,
97.Xr renice 8
98.Sh HISTORY
99A
100.Nm
101command appeared in
102.At v6 .
103.Sh BUGS
104.Nm Nice
105is particular to
106.Xr sh 1 .
107If you use
108.Xr csh 1 ,
109then commands executed with ``&'' are automatically immune to hangup
110signals while in the background.
111.Pp
112.Nm Nice
113is built into
114.Xr csh 1
115with a slightly different syntax than described here. The form
116.Ql nice +10
117nices to positive nice, and
118.Ql nice \-10
119can be used
120by the super-user to give a process more of the processor.