LFCS Question #520: Real Exam Question with Answer & Explanation

Question

How is the file format of /etc/crontab different from a normal crontab file? (Select TWO).

Options

• AThe /etc/crontab file can specify a year field.
• BA normal crontab file must be installed with the crontab command.
• CA normal crontab file allows for environment variable substitution.
• DThe /etc/crontab file has a user field for commands.

Explanation

The /etc/crontab file differs from a normal user crontab by including a user field for commands and by being directly editable, whereas user crontabs are installed via the crontab command.

Common mistakes.

• A. Neither /etc/crontab nor a normal user crontab typically include a year field; cron jobs are scheduled based on the standard five time/date fields.
• C. Both /etc/crontab and normal user crontab files allow for environment variable substitution and definition within their respective formats.

Concept tested. Crontab file formats and management

Reference. https://man7.org/linux/man-pages/man5/crontab.5.html

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