Update cheatsheets

tlmgr-shell

@@ -0,0 +1,41 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# tlmgr shell
+
+> Start an interactive shell of the native TeX Live manager.
+> More information: <https://www.tug.org/texlive/tlmgr.html>.
+
+- Start an interactive shell of `tlmgr`:
+
+`tlmgr shell`
+
+- Run any `tlmgr` subcommand in the interactive shell:
+
+`{{subcommand}} {{arguments}}`
+
+- Quit the interactive shell:
+
+`quit`
+
+- List all TeX Live variables:
+
+`get`
+
+- Get the value of a TeX Live variable:
+
+`get {{variable}}`
+
+- Set the value of a TeX Live variable:
+
+`set {{variable}} {{value}}`
+
+- Restart the interactive shell:
+
+`restart`
+
+- Display the version of the current protocol:
+
+`protocol`