Update cheatsheets

linux/systemctl

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl
+
+> Control the systemd system and service manager.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html>.
+
+- Show all running services:
+
+`systemctl status`
+
+- List failed units:
+
+`systemctl --failed`
+
+- Start/Stop/Restart/Reload a service:
+
+`systemctl {{start|stop|restart|reload}} {{unit}}`
+
+- Show the status of a unit:
+
+`systemctl status {{unit}}`
+
+- Enable/Disable a unit to be started on bootup:
+
+`systemctl {{enable|disable}} {{unit}}`
+
+- Mask/Unmask a unit to prevent enablement and manual activation:
+
+`systemctl {{mask|unmask}} {{unit}}`
+
+- Reload systemd, scanning for new or changed units:
+
+`systemctl daemon-reload`
+
+- Check if a unit is enabled:
+
+`systemctl is-enabled {{unit}}`