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system/systemd/making services.md

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+# Basics
+
+A service can consist of two files - the .sh script to run, and the .service file which describes its run conditions.
+
+The .service file goes in /etc/systemd/system.  The scripts themselves might be best placed in $HOME/.local/bin.
+
+# Example - tracker.service
+
+```
+[Unit]
+Description=Tracker
+
+[Service]
+Type=simple
+ExecStart=/path/to/script
+
+[Install]
+WantedBy=multi-user.target
+
+
+```
+
+After making the new service, systemd requires reloading:
+
+> sudo systemctl daemon-reload
+
+# Types
+
+* simple - the service cannot be called on by others.  It runs on repeat.
+
+* oneshot - the service executes once, then stops.
+
+
+