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Old 06-16-2009, 05:31 PM   #1
mitchell2345
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Registered: Aug 2008
Posts: 55

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run script for X mins


hi,

I am recording off my firewire port. Long story but i cant get Mythtv to work yet. I can use test-mpeg2 -r 1 > file.ts. this just dumps the video to disk

How can i create a crontab/script that will run that cmd for a specified time period

ie, start cmd and 22:00 stop at 22:30

Thanks,
Mitchell
 
Old 06-16-2009, 06:08 PM   #2
Trumpen
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Registered: Dec 2008
Location: Italy
Distribution: Debian & Ubuntu
Posts: 11

Rep: Reputation: 0
You can create a script like this:
Code:
#!/bin/bash

command &

sleep 1800 # 30*60 seconds

kill $! # $! contains PID of the last background executed process
If you need more precision you can use a while loop instead of sleep:

Code:
#!/bin/bash

end=$(date -d "+30 minutes" '+%s')

command &

while [ "$(date '+%s')" -lt "$end" ]; do
       sleep 1;
done

kill $!
 
  


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