125 lines
3.5 KiB
Groff
125 lines
3.5 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)nice.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd June 6, 1993
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.Dt NICE 1
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.Os
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.Sh NAME
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.Nm nice
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.Nd execute a utility at an altered scheduling priority
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.Sh SYNOPSIS
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.Nm
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.Op Fl n Ar increment
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.Ar utility
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.Op Ar argument ...
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.Sh DESCRIPTION
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The
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.Nm
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utility runs
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.Ar utility
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at an altered scheduling priority, by incrementing its
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.Dq nice
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value by the specified
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.Ar increment ,
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or a default value of 10.
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The lower the nice value of a process, the higher its scheduling priority.
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.Pp
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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
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Some shells may provide a builtin
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.Nm
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command which is similar or identical to this utility.
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Consult the
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.Xr builtin 1
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manual page.
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.Sh ENVIRONMENT
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The
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.Ev PATH
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environment variable is used to locate the requested
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.Ar utility
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if the name contains no
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.Ql /
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characters.
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.Sh EXAMPLES
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Execute utility
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.Sq date
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at priority 5 assuming the priority of the
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shell is 0:
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.Pp
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.Dl "nice -n 5 date"
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.Pp
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Execute utility
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.Sq date
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at priority -19 assuming the priority of the
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shell is 0 and you are the super-user:
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.Pp
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.Dl "nice -n 16 nice -n -35 date"
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.Sh DIAGNOSTICS
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If
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.Ar utility
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is invoked, the exit status of
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.Nm
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is the exit status of
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.Ar utility .
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.Pp
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An exit status of 126 indicates
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.Ar utility
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was found, but could not be executed.
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An exit status of 127 indicates
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.Ar utility
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could not be found.
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.Sh SEE ALSO
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.Xr builtin 1 ,
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.Xr csh 1 ,
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.Xr idprio 1 ,
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.Xr rtprio 1 ,
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.Xr getpriority 2 ,
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.Xr setpriority 2 ,
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.Xr renice 8
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.Sh COMPATIBILITY
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The traditional
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.Fl Ns Ar increment
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option has been deprecated but is still supported.
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.1-2001 .
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v4 .
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