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35 .\" @(#)sleep.1 8.3 (Berkeley) 4/18/94
36 .\" $FreeBSD: src/bin/sleep/sleep.1,v 1.15.2.3 2003/01/24 02:44:43 keramida Exp $
43 .Nd suspend execution for an interval of time
51 suspends execution for a minimum of
56 command receives a signal, it takes the standard action.
57 .Sh IMPLEMENTATION NOTES
60 signal is not handled specially by this implementation.
64 command will accept and honor a non-integer number of specified seconds
67 character as a decimal point).
69 This is a non-portable extension, and its use will nearly guarantee that
70 a shell script will not execute properly on another system.
73 To schedule the execution of a command for
75 number seconds later (with
78 .Dl (sleep 1800; sh command_file >& errors)&
80 This incantation would wait a half hour before
81 running the script command_file.
86 To reiteratively run a command (with the
89 .Bd -literal -offset indent -compact
91 if (! -r zzz.rawdata) then
94 foreach i (`ls *.rawdata`)
96 awk -f collapse_data $i >> results
103 The scenario for a script such as this might be: a program currently
104 running is taking longer than expected to process a series of
105 files, and it would be nice to have
106 another program start processing the files created by the first
107 program as soon as it is finished (when zzz.rawdata is created).
108 The script checks every five minutes for the file zzz.rawdata,
109 when the file is found, then another portion processing
110 is done courteously by sleeping for 70 seconds in between each
120 command is expected to be