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Every 20 minutes test if host with IP 192.168.0.14 is 'dead' or not reachable.
The line should be put in your crontab file.
There are 9 alternatives - vote for the best!
Cleaner with a mailto assignment in crontab (if the command fails you get an email):
10,30,50 * * * * ping -q -c1 -w3 192.168.0.14 >/dev/null
If you can do better, submit your command here.
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