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33 .\" @(#)sleep.1 8.3 (Berkeley) 4/18/94
40 .Nd suspend execution for an interval of time
48 suspends execution for a minimum of
50 It is usually used to schedule the execution of other commands (see
57 command will accept and honor a non-integer number of specified seconds.
58 This is a non-portable extension, and its use will nearly guarantee that
59 a shell script will not execute properly on another system.
63 signal is received, the estimate of the amount of seconds left to
64 sleep is printed on the standard output.
68 utility exits with one of the following values:
71 On successful completion, or if the signal
78 To schedule the execution of a command for 1800 seconds later:
80 .Dl (sleep 1800; sh command_file \*[Gt]\*[Am] errors)\*[Am]
82 This incantation would wait half an hour before
83 running the script command_file.
88 To reiteratively run a command (with
91 .Bd -literal -offset indent -compact
93 if (! -r zzz.rawdata) then
98 awk -f collapse_data $i \*[Gt]\*[Gt] results
105 The scenario for a script such as this might be: a program currently
106 running is taking longer than expected to process a series of
107 files, and it would be nice to have
108 another program start processing the files created by the first
109 program as soon as it is finished (when zzz.rawdata is created).
110 The script checks every five minutes for the file zzz.rawdata,
111 when the file is found, then another portion processing
112 is done courteously by sleeping for 70 seconds in between each
121 command is expected to be