Update cheatsheets

tldr/linux/xhost

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xhost
+
+> Manage access control lists for X server connections.
+> More information: <https://manned.org/xhost>.
+
+- Display the current access control list:
+
+`xhost`
+
+- Allow a specific host to connect to the X server:
+
+`xhost +{{hostname}}`
+
+- Deny a specific host from connecting to the X server:
+
+`xhost -{{hostname}}`
+
+- Allow all hosts to connect (disable access control — insecure):
+
+`xhost +`
+
+- Deny all hosts except those explicitly allowed (enable access control):
+
+`xhost -`
+
+- Remove a specific user or address using a family prefix (like `inet:hostname` or `si:localuser:username`):
+
+`xhost -{{family:name}}`