Linux is a Unix-like, mostly POSIX-compatible operating system. It is among the most widely used operating systems today.
Scheduling is the concept of allowing a task to run at regular intervals, after another event or at a later date. It's an important concept to understand and use as it allows repetitive tasks to be automated reliably.
Public questions (free plan) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
The output of crontab -l contains the following job definitions:
MAILTOemail@example.com,firstname.lastname@example.org 0 0,12 1 */4 * df -h / @hourly du -h / >> /var/log/disk_usage 0 6 1-12 * * /usr/bin/testdome_candidates
Select all the statements about the job definitions and schedules that are correct.