125 lines
3.9 KiB
Groff
125 lines
3.9 KiB
Groff
.\" $NetBSD: sleep.1,v 1.13 2000/09/04 07:30:13 kleink Exp $
|
|
.\"
|
|
.\" Copyright (c) 1990, 1993, 1994
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" the Institute of Electrical and Electronics Engineers, Inc.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" 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
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)sleep.1 8.3 (Berkeley) 4/18/94
|
|
.\"
|
|
.Dd April 18, 1994
|
|
.Dt SLEEP 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm sleep
|
|
.Nd suspend execution for an interval of time
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Ar seconds
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility
|
|
suspends execution for a minimum of
|
|
.Ar seconds .
|
|
It is usually used to schedule the execution of other commands (see
|
|
.Sx EXAMPLES
|
|
below).
|
|
.Pp
|
|
Note: The
|
|
.Nx
|
|
.Nm
|
|
command will accept and honor a non-integer number of specified
|
|
seconds. This is a non-portable extension, and its use will nearly
|
|
guarantee that a shell script will not execute properly on another
|
|
system.
|
|
.Sh EXIT STATUS
|
|
The
|
|
.Nm
|
|
utility exits with one of the following values:
|
|
.Bl -tag -width flag
|
|
.It Li \&0
|
|
On successful completion, or if the signal
|
|
.Dv SIGALRM
|
|
was received.
|
|
.It Li \&>\&0
|
|
An error occurred.
|
|
.El
|
|
.Sh EXAMPLES
|
|
To schedule the execution of a command for
|
|
.Va x
|
|
number seconds later:
|
|
.Pp
|
|
.Dl (sleep 1800; sh command_file >& errors)&
|
|
.Pp
|
|
This incantation would wait a half hour before
|
|
running the script command_file. (See the
|
|
.Xr at 1
|
|
utility.)
|
|
.Pp
|
|
To reiteratively run a command (with the
|
|
.Xr csh 1 ) :
|
|
.Pp
|
|
.Bd -literal -offset indent -compact
|
|
while (1)
|
|
if (! -r zzz.rawdata) then
|
|
sleep 300
|
|
else
|
|
foreach i (`ls *.rawdata`)
|
|
sleep 70
|
|
awk -f collapse_data $i >> results
|
|
end
|
|
break
|
|
endif
|
|
end
|
|
.Ed
|
|
.Pp
|
|
The scenario for a script such as this might be: a program currently
|
|
running is taking longer than expected to process a series of
|
|
files, and it would be nice to have
|
|
another program start processing the files created by the first
|
|
program as soon as it is finished (when zzz.rawdata is created).
|
|
The script checks every five minutes for the file zzz.rawdata,
|
|
when the file is found, then another portion processing
|
|
is done courteously by sleeping for 70 seconds in between each
|
|
awk job.
|
|
.Sh SEE ALSO
|
|
.Xr nanosleep 2 ,
|
|
.Xr sleep 3 ,
|
|
.Xr at 1
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm
|
|
command is expected to be
|
|
.St -p1003.2
|
|
compatible.
|