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Editing: sleep.1
.\"- .\" 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. 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 .\" $FreeBSD$ .\" .Dd December 31, 2020 .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. When the .Dv SIGINFO signal is received, the estimate of the amount of seconds left to sleep is printed on the standard output. .Sh IMPLEMENTATION NOTES The .Dv SIGALRM signal is not handled specially by this implementation. .Pp The .Nm command allows and honors a non-integer number of seconds to sleep in any form acceptable by .Xr strtod 3 . This is a non-portable extension, but is also implemented in GNU sh-utils since version 2.0a (released in 2002). .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 .
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