add systemctl.md

linux/systemctl.md

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+# systemctl
+
+> Control the systemd system and service manager
+
+- List failed units
+
+`systemctl --failed`
+
+- Start/Stop/Restart a service
+
+`systemctl start/stop/restart {{unit}}`
+
+- Show the status of a unit
+
+`systemctl status {{unit}}`
+
+- Enable/Disable a unit to be started on bootup
+
+`systemctl enable/disable {{unit}}`
+
+- Reload systemd, scanning for new or changed units
+
+`systemctl daemon-reload`