sleeping for 30 seconds
Hello world, I've got a shell script that in essence does this: FOREVER: pre-process stuff mainapp post-process stuff If the mainapp returns too soon, the assumption must be that there is a configuration problem of some sort. Under those conditions, I don't want to immediately jump to the pre-process stuff and start the mainapp again. Instead, I want to sleep for an arbitrary time between attempts (giving an operator some leeway to fix the configuration before trying again). If mainapp runs long enough, then it should just post-, pre- mainapp again immediately. What's a good sh algorithm for the above? (assume 10 seconds indicates error condition and a 50 second sleep between iterations when necessary, and I don't need a 'five attempts then sleep' thing). Also, assume I've simplified for the home audience. The sh script is lots more involved then the example above implies. rip ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sleeping for 30 seconds
On Fri, 26 Mar 2004, Richard P. Williamson wrote: What's a good sh algorithm for the above? (assume 10 seconds indicates error condition and a 50 second sleep between iterations when necessary, and I don't need a 'five attempts then sleep' thing). Also, assume I've simplified for the home audience. The sh script is lots more involved then the example above implies. You might, if the possibility is there, want to use the exit value of the main process to indicate errors, which is perhaps a little more reliable. If you want the time in seconds between two points, you might try something like this: start_time=`date +%s` # ... do something end_time=`date +%s` time_taken=$(($end_time - $start_time)) -- jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/ Tel +44(0)117 9287088 Fax +44 (0)117 9287112 http://ioctl.org/jan/ New Freedom of Information Act: theirs, to yours. Happy now? ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: sleeping for 30 seconds
At 13:08 26/03/2004, Jan Grant wrote: On Fri, 26 Mar 2004, Richard P. Williamson wrote: You might, if the possibility is there, want to use the exit value of the main process to indicate errors, which is perhaps a little more reliable. Except it doesn't tell me how long it ran for before it falling over, which is the bit I need to look at. If you want the time in seconds between two points, you might try something like this: start_time=`date +%s` # ... do something end_time=`date +%s` time_taken=$(($end_time - $start_time)) That's what I'm looking for, thanks! (that, and ) if [ $time_taken -lt 10 ]; then sleep 50 fi Regards, and thanks! rip ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
