09-28-2009
cfajohnson:
Thanks very much for the feedback. UUoC! I didn't know what that was until a little Google help... I'll demoggify the original script in a few minutes.
The reason I didn't use a variable is that the problem I'm trying to solve is when sleep is used by a process that doesn't have a terminal (scheduled from crontab or backgrounded and the parent shell terminated). Unless there's a way to set up variables that can be accessed from any shell on the system... Sometimes when I schedule a job with cron with the execution length controlled by sleep, I want to be able to reset the execution length. I'm sure there is a much cleaner way to do this than a temp file though.
---------- Post updated at 01:58 PM ---------- Previous update was at 01:41 PM ----------
Corona688:
Man that's pretty cool! (I only looked at the code, haven't tried it yet) You're right that it would probably be done better in C, but I'm still working on learning C. But thank you very much for taking the time to actually code something in C as an example for a better approach. That's what makes the people of unix.com so great!
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SLEEP(1) BSD General Commands Manual SLEEP(1)
NAME
sleep -- suspend execution for an interval of time
SYNOPSIS
sleep seconds
DESCRIPTION
The sleep command suspends execution for a minimum of seconds.
If the sleep command receives a signal, it takes the standard action.
IMPLEMENTATION NOTES
The SIGALRM signal is not handled specially by this implementation.
The sleep command will accept and honor a non-integer number of specified seconds (with a '.' character as a decimal point). This is a non-
portable extension, and its use will nearly guarantee that a shell script will not execute properly on another system.
EXIT STATUS
The sleep utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
To schedule the execution of a command for x number seconds later (with csh(1)):
(sleep 1800; sh command_file >& errors)&
This incantation would wait a half hour before running the script command_file. (See the at(1) utility.)
To reiteratively run a command (with the csh(1)):
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
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.
SEE ALSO
nanosleep(2), sleep(3)
STANDARDS
The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
HISTORY
A sleep command appeared in Version 4 AT&T UNIX.
BSD
April 18, 1994 BSD