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Systems & Data Center · Foundational

systemctl

The command-line tool for controlling systemd units and inspecting system state.

Definition

Common verbs are start, stop, restart, reload, status, enable (start at boot), disable, mask (prevent any start), is-active and list-units. enable --now starts and enables in one step.

Example

systemctl enable --now httpd starts Apache immediately and at every boot.

Exam tip

start affects only the current boot while enable affects future boots; mask blocks even manual starts.

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