Move pages under tldr, lint run.sh, update docs

tldr/linux/hostnamectl

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# hostnamectl
+
+> Get or set the hostname of the computer.
+> More information: <https://manned.org/hostnamectl>.
+
+- Get the hostname of the computer:
+
+`hostnamectl`
+
+- Set the hostname of the computer:
+
+`sudo hostnamectl set-hostname "{{hostname}}"`
+
+- Set a pretty hostname for the computer:
+
+`sudo hostnamectl set-hostname --static "{{hostname.example.com}}" && sudo hostnamectl set-hostname --pretty "{{hostname}}"`
+
+- Reset hostname to its default value:
+
+`sudo hostnamectl set-hostname --pretty ""`