XK0-005 Question #125: Real Exam Question with Answer & Explanation

The correct answer is B: 15 13 * * 5 df > /freespace. The cron job entry 15 13 5 df > /freespace correctly schedules the df command to run at 1:15 p.m. (13:15 in 24-hour format) every Friday (day of week 5) and redirects its output to /freespace.

System Management

Question

A Linux administrator needs to schedule a cron job to run at 1:15 p.m. every Friday to report the amount of free disk space on the system and to send the output to a file named "freespace". Which of the following would meet this requirement?

Options

A13 15 * * 5 df > /freespace
B15 13 * * 5 df > /freespace
C15 1 * * 6 df > /freespace
D15 13 6 * * df > /freespace

Explanation

The cron job entry 15 13 * * 5 df > /freespace correctly schedules the df command to run at 1:15 p.m. (13:15 in 24-hour format) every Friday (day of week 5) and redirects its output to /freespace.

Common mistakes.

A. The minute and hour fields are swapped; 13 15 would mean 3:13 p.m. instead of 1:15 p.m.
C. 15 1 * * 6 would run at 1:15 a.m. on Saturday, not 1:15 p.m. on Friday.
D. 15 13 6 * * would run at 1:15 p.m. on the 6th day of every month, not specifically every Friday.

Concept tested. Cron job scheduling syntax

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

Topics

#cron jobs#task scheduling#df command#I/O redirection

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