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+## Name
+
+su - switch to another user
+
+## Synopsis
+
+```sh
+$ su <user>
+```
+
+## Description
+
+`su`: Switch to another user.
+
+When called with no user-specified, `su` defaults to switch to the *root* user. Need to enter the password if the user switch to has one.
+
+## Arguments
+
+* `user`: User to switch to (defaults to the user with UID 0)
+
+## Examples
+
+Switch to root user
+
+```sh
+$ su
+```
+
+Switch to another user
+
+```sh
+$ su nona
+```