Update cheatsheets

tldr/linux/cec-ctl

@@ -0,0 +1,22 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cec-ctl
+
+> Control kernel CEC devices.
+> See also: `cec-client`.
+> More information: <https://manned.org/cec-ctl>.
+
+- List CEC devices:
+
+`cec-ctl --list-devices`
+
+- Monitor CEC traffic:
+
+`sudo cec-ctl {{[-m|--monitor]}}`
+
+- Show CEC topology:
+
+`cec-ctl {{[-S|--show-topology]}}`