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I need to execute this command:
every minute, how can I do this?
Adding this to (as root) cron is probably what you are after
sudo crontab -e
then add the following
* * * * * /usr/sbin/ddclient -force
CTRL + X
Do you want to retry the same edit? (y/n) y crontab: installing new crontab "/tmp/crontab.NIZK9e/crontab":24: bad command errors in crontab file, can't install. Do you want to retry the same edit? (y/n)
1 * * * *
* 1 * * 6
Required, but never shown