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author | 2021-05-09 14:20:58 -0400 | |
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committer | 2021-05-09 14:20:58 -0400 | |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /shell_cmds/sleep/sleep.1 | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'shell_cmds/sleep/sleep.1')
-rw-r--r-- | shell_cmds/sleep/sleep.1 | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/shell_cmds/sleep/sleep.1 b/shell_cmds/sleep/sleep.1 new file mode 100644 index 0000000..f5215be --- /dev/null +++ b/shell_cmds/sleep/sleep.1 @@ -0,0 +1,124 @@ +.\"- +.\" 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. +.\" 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 +.\" $FreeBSD: src/bin/sleep/sleep.1,v 1.22 2005/01/16 16:41:59 ru Exp $ +.\" +.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 +command +suspends execution for a minimum of +.Ar seconds . +.Pp +If the +.Nm +command receives a signal, it takes the standard action. +.Sh IMPLEMENTATION NOTES +The +.Dv SIGALRM +signal is not handled specially by this implementation. +.Pp +The +.Nm +command will accept and honor a non-integer number of specified seconds +(with a +.Ql .\& +character as a decimal point). +.Bf Sy +This is a non-portable extension, and its use will nearly guarantee that +a shell script will not execute properly on another system. +.Ef +.Sh EXIT STATUS +.Ex -std +.Sh EXAMPLES +To schedule the execution of a command for +.Va x +number seconds later (with +.Xr csh 1 ) : +.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 +.Sh STANDARDS +The +.Nm +command is expected to be +.St -p1003.2 +compatible. +.Sh HISTORY +A +.Nm +command appeared in +.At v4 . |