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POGet a Unix script to run at exactly the same time every time
 

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  1. POGet a Unix script to run at exactly the same time every time
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    <p>I am writing a script to capture disk usage on a system (yes, I know there is software that can do this). For database reporting purposes, I want the interval between data points to be as equal as possible. For example, if I am polling disk usage every 10 minutes, I want every data point to be YYYY-MM-DD HH:[0-5]0:00. If I'm am polling every 5 minutes, it would be YYYY-MM-DD HH:[0-5][05]:00.</p> <p>If I have a ksh script (or even a Perl script) to capture the disk usage, how can I let the script come active and wait for the next "Poll time" before taking a snapshot, and then sleep for the correct number of seconds until the next "Poll time". If I am polling every 5 minutes, and it is 11:42:00, then I want to sleep for 180 seconds so it will take a snapshot at 11:45:00 - and then sleep for 5 minutes so it will take another snapshot at 11:50:00.</p> <p>I wrote a way that works if my poll time is every 10 minutes, but if I change the poll time to a different number, it doesn't work. I would like it to be flexible on the poll time.</p> <p>I prefer to do this in shell script, but if it is way too much code, Perl would be fine too.</p> <p>Any ideas on how to accomplish this?</p> <p>Thanks in advance!</p> <p>Brian</p> <p><strong>EDIT</strong>: Wow - I left out a pretty important part - that cron is disabled, so I will not be able to use cron for this task. I am very sorry to all the people who gave that as an answer, because yes, that is the perfect way to do what I wanted, if I could use cron.</p> <p>I will be using our scheduler to kick off my script right before midnight every day, and I want the script to handle running at the exact "poll times", sleeping in between, and exiting at midnight.</p> <p>Again, I'm very sorry for not clarifying on crontabs.</p>
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    1. COUnless you're using some real time extensions, you can't get *exactly* the same time, but depending what you need, you might be close enough.
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      1. USPaul Tomblin
 

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