Home » LPI » 117-201 » Which two utilities can you use to set up a job to run at a specified time?
Which two utilities can you use to set up a job to run at a specified time?
A. at and crond
B. atrun and crontab
C. at and crontab
D. atd and crond
Correct Answer: C
Explanation/Reference:
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.
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