Unix Script Emergency

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July 1st, 2004, 10:43 AM

chaztro1892

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Unix Script Emergency

I am new to the Unix world. I have to create a script that will run a command every five minutes or at a specified interval. Anyone have any suggestions. Thank you in advance.

July 1st, 2004, 11:07 AM

yogi27

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You can create a cron job. Cron jobs can be scheduled anytime, anyday of the year. You can get lots of stuff on cron jobs on google.

-Yogesh.

July 1st, 2004, 11:29 AM

jim mcnamara

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Code:

# five minutes in seconds
let sleeptime=60*5
while true
do
     sleep $sleeptime
     # execute a script or whatever here
done

July 1st, 2004, 03:03 PM

stevengs

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Hi Jim,

what does sleep do between activity? Is that a unix system call? Does it use a software interrupt? It doesn't poll does it?

-Steven

July 1st, 2004, 03:50 PM

jim mcnamara

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The kernel sends SIGALARM to bring the process back to 'life'.

See alarm(). Meanwhile the process is not active, nor it it polling.

sleep in a shell script is the same as calling the system routines alarm() and pause().

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