freebsd-dev/usr.bin/nice/nice.1

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.\" Copyright (c) 1980, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" @(#)nice.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
.Dd February 24, 2011
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.Dt NICE 1
.Os
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.Sh NAME
.Nm nice
.Nd execute a utility at an altered scheduling priority
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.Sh SYNOPSIS
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.Nm
.Op Fl n Ar increment
.Ar utility
.Op Ar argument ...
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.Sh DESCRIPTION
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The
.Nm
utility runs
.Ar utility
at an altered scheduling priority, by incrementing its
.Dq nice
value by the specified
.Ar increment ,
or a default value of 10.
The lower the nice value of a process, the higher its scheduling priority.
.Pp
The superuser may specify a negative increment in order to run a utility
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with a higher scheduling priority.
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.Pp
Some shells may provide a builtin
.Nm
command which is similar or identical to this utility.
Consult the
.Xr builtin 1
manual page.
.Sh ENVIRONMENT
The
.Ev PATH
environment variable is used to locate the requested
.Ar utility
if the name contains no
.Ql /
characters.
.Sh EXIT STATUS
If
.Ar utility
is invoked, the exit status of
.Nm
is the exit status of
.Ar utility .
.Pp
An exit status of 126 indicates
.Ar utility
was found, but could not be executed.
An exit status of 127 indicates
.Ar utility
could not be found.
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.Sh EXAMPLES
Execute utility
.Sq date
at priority 5 assuming the priority of the
shell is 0:
.Pp
.Dl "nice -n 5 date"
.Pp
Execute utility
.Sq date
at priority -19 assuming the priority of the
shell is 0 and you are the super-user:
.Pp
.Dl "nice -n 16 nice -n -35 date"
.Sh COMPATIBILITY
The traditional
.Fl Ns Ar increment
option has been deprecated but is still supported.
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.Sh SEE ALSO
.Xr builtin 1 ,
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.Xr csh 1 ,
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.Xr idprio 1 ,
.Xr rtprio 1 ,
.Xr getpriority 2 ,
.Xr setpriority 2 ,
.Xr renice 8
.Sh STANDARDS
The
.Nm
utility conforms to
.St -p1003.1-2001 .
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.Sh HISTORY
A
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.Nm
utility appeared in
.At v4 .