feat: article about syncthing

knowledge base/syncthing.md

@@ -0,0 +1,44 @@
+# Syncthing
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL;DR
+
+```sh
+# Installation.
+sudo apt install 'syncthing'
+brew install --cask 'syncthing'
+sudo zypper install 'syncthing'
+
+# Startup.
+syncthing
+syncthing --gui-address '0.0.0.0:8384' --no-default-folder
+systemctl --user start 'syncthing.service'
+```
+
+## Further readings
+
+- [Website]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- [The GUI listen address]
+- [File versioning]
+
+<!--
+  References
+  -->
+
+<!-- Upstream -->
+[file versioning]: https://docs.syncthing.net/users/versioning.html
+[the gui listen address]: https://docs.syncthing.net/users/guilisten.html
+[website]: https://syncthing.net/
+
+<!-- In-article sections -->
+[further readings]: #further-readings

knowledge base/systemd.md

@@ -45,6 +45,9 @@ systemctl --user disable --now 'davmail.service'
 # Check a service is currently active.
 systemctl is-active 'wpa_supplicant.service'
 
+# Reboot the system.
+systemctl reboot
+
 # Suspend the system.
 # Saves the state to RAM only.
 systemctl suspend