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Examen 201 : Advanced Administration »
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Question 1/20
Explanation: The 'at' command is used to execute commands at a specified time and optional date. A cron job is
a program or script scheduled at a specified time. The 'crontab' program is used to create user cron jobs.
Reference: http://www.oreillynet.com/linux/cmd/a/at.html http://www.oreillynet.com/linux/cmd/c/crontab.html
Incorrect Answers.
A: The Cron daemon (crond) is the program that runs the cron job at the specified time. It is not used to set up a
cron job.
B: Atrun is used to run jobs scheduled by the 'at' program. It is not used to set up a job to run at a specified time.
D: Atd is the 'at' deamon. Similar to the cron daemon, it is the program that runs the jobs scheduled with the 'at'
command.