Bash Shell Scripting - Scheduling Concepts

This video tutorial covers the basics of scheduling jobs on a Linux system using commands like ADD, Batch, and Cron. It explains how each command functions, with a focus on the conditions under which they execute tasks. The tutorial also delves into the format and usage of crontab entries, providing examples to illustrate how to schedule tasks at specific times or intervals. The video concludes with a brief summary and a preview of the next tutorial, which will involve practical demonstrations on a Linux system.

What is the main difference between the ADD and Batch commands in Linux job scheduling?

• ADD runs tasks only during low system load.

• Batch runs tasks only during low system load.

• ADD can schedule recurring tasks.

• Batch can schedule recurring tasks.

What is the role of the Cron daemon in Linux?

• It updates crontab entries.

• It manages user permissions.

• It executes scheduled tasks.

• It monitors system load.

Which command is used to modify crontab entries?

• Cron

• Crontab

• ADD

• Batch

In a crontab entry, what does an asterisk (*) in the minute field signify?

• Every minute

• Every month

• Every hour

• Every day

How would you schedule a task to run every third hour using crontab?

• 0 */3 * * *

• 3 0 * * *

• 0 3 * * *

• */3 * * * *

What does the crontab entry '0 5 * * *' do?

• Runs a task every 5 hours.

• Runs a task on the 5th day of the month.

• Runs a task at 5 AM every day.

• Runs a task every 5 minutes.

Which months are represented by the numbers 3, 6, 9, and 12 in a crontab entry?

• March, June, September, December

• April, July, October, January

• June, September, December, March

• May, August, November, February