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Which command with all parameters and arguments, can be used by root to erase the cron job list for the user f

Which command with all parameters and arguments, can be used by root to erase the cron job list
for the user fred?

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Answer: crontab -u

Explanation:
fred -r

From the crontab manpage
-u Specify the name of the user
-r Remove the current crontab

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