NetBSD/usr.bin/nice/nice.1

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.\" $NetBSD: nice.1,v 1.12 2001/12/08 19:09:35 wiz Exp $
.\"
.\" Copyright (c) 1980, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" notice, this list of conditions and the following disclaimer.
.\" 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" 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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.\"
.Dd June 6, 1993
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.Dt NICE 1
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.Os
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.Sh NAME
.Nm nice
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.Nd execute a utility with an altered scheduling priority
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.Sh SYNOPSIS
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.Nm
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.Op Fl n Ar increment
.Ar utility
.Op Ar argument ...
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.Sh DESCRIPTION
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.Nm
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runs
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.Ar utility
at an altered scheduling priority.
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If an
.Ar increment
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is given, it is used; otherwise
an increment of 10 is assumed.
The super-user can run utilities with priorities higher than normal by using
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a negative
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.Ar increment .
The priority can be adjusted over a
range of -20 (the highest) to 20 (the lowest). A priority of 19 or 20
will prevent a process from taking any cycles from others at nice 0 or
better.
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.Pp
Available options:
.Bl -tag -width indent
.It Fl n Ar increment
A positive or negative decimal integer used to modify the system scheduling
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priority of
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.Ar utility .
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.El
.Sh EXIT STATUS
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The
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.Nm
utility exits with one of the following values:
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.Bl -tag -width indent
.It 1-125
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An error occurred in the
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.Nm
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utility.
.It 126
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The
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.Ar utility
was found but could not be invoked.
.It 127
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The
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.Ar utility
could not be found.
.El
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.Pp
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Otherwise, the exit status of
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.Nm
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will be that of
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.Ar utility .
.Sh COMPATIBILITY
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The historic
.Fl Ns Ar increment
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option has been deprecated but is still supported in this implementation.
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.Sh SEE ALSO
.Xr csh 1 ,
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.Xr getpriority 2 ,
.Xr setpriority 2 ,
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.Xr renice 8
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.Sh STANDARDS
The
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.Nm
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utility conforms to
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.St -p1003.2-92 .
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.Sh HISTORY
A
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.Nm
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utility appeared in
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.At v6 .
.Sh BUGS
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.Nm
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is built into
.Xr csh 1
with a slightly different syntax than described here. The form
.Ql nice +10
nices to positive nice, and
.Ql nice \-10
can be used
by the super-user to give a process more of the processor.