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author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-26 06:18:55 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-26 06:18:55 +0000 |
commit | e3cfc8ce61f788739c66445d903f8beacb40c93d (patch) | |
tree | ba7beef9ee9289c4383bad976f88710e44c98b4d /bin/sleep/sleep.1 | |
parent | 862fdf11a2ede45dec0da01ed575525d79468981 (diff) | |
download | FreeBSD-src-e3cfc8ce61f788739c66445d903f8beacb40c93d.zip FreeBSD-src-e3cfc8ce61f788739c66445d903f8beacb40c93d.tar.gz |
BSD 4.4 Lite bin Sources
Diffstat (limited to 'bin/sleep/sleep.1')
-rw-r--r-- | bin/sleep/sleep.1 | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/bin/sleep/sleep.1 b/bin/sleep/sleep.1 new file mode 100644 index 0000000..2148b7a --- /dev/null +++ b/bin/sleep/sleep.1 @@ -0,0 +1,116 @@ +.\" 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 sleep +.Ar seconds +.Sh DESCRIPTION +The +.Nm sleep +command +suspends execution for a minimum of +.Ar seconds . +.Nm Sleep +is used to schedule the execution of other commands (see +.Sx EXAMPLES +below). +.Pp +The +.Nm Sleep +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 setitimer 2 , +.Xr alarm 3 , +.Xr sleep 3 , +.Xr at 1 +.Sh STANDARDS +The +.Nm sleep +command is expected to be +.St -p1003.2 +compatible. |