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15.One of your users, Bob, has created a script to reindex his database. Now he has it scheduled to run every day at 10:30 am. What command should you use to delete this job?

crontab –ru bob
crontab –u bob
crontab –du bob
crontab –lu bob

Explanation: The –r option used with the crontab command is used to delete a cron job. The ‘u’ option is used to specify which user’s crontab file, the command will be acted upon.

Reference: http://www.oreillynet.com/linux/cmd/c/crontab.html

Incorrect Answers
B: This command will give an error because you have specified no actions to be taken.
C: There is no –d option with crontab.
D: The –l option will display the user’s crontab file as.
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