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32 .\" @(#)sleep.1 8.3 (Berkeley) 4/18/94
40 .Nd suspend execution for an interval of time
48 suspends execution for a minimum of
53 command receives a signal, it takes the standard action.
56 signal is received, the estimate of the amount of seconds left to
57 sleep is printed on the standard output.
58 .Sh IMPLEMENTATION NOTES
61 signal is not handled specially by this implementation.
65 command allows and honors a non-integer number of seconds to sleep
66 in any form acceptable by
68 This is a non-portable extension, and its use will nearly guarantee that
69 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
118 command is expected to be