How to remove a crontab file?
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crontab -t
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crontab -l
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crontab -e
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crontab -r
D
Correct answer
Explanation
The crontab -r command removes the current user's crontab file completely. In contrast, crontab -l lists the crontab contents, crontab -e opens it for editing, and crontab -t is not a valid crontab option.