Automation & Scripting

Scheduling tasks with cron, at, and systemd timers; writing basic Bash scripts with variables, conditionals, and loops. Roughly 7% of the EX200 exam.

Task scheduling (cron & at)

Per-user crontabs, system cron files, one-shot at jobs, and the five-field cron expression syntax with shortcuts like @daily.

Shebangs, positional arguments, test expressions, if/then/else, for/while loops, exit codes, and command substitution.