Update cheatsheets

tldr/linux/su

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# su
+
+> Switch shell to another user.
+> More information: <https://manned.org/su>.
+
+- Switch to superuser (requires the root password):
+
+`su`
+
+- Switch to a given user (requires the user's password):
+
+`su {{username}}`
+
+- Switch to a given user and simulate a full login shell:
+
+`su - {{username}}`
+
+- Execute a command as another user:
+
+`su - {{username}} {{[-c|--command]}} "{{command}}"`