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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.
## Options:
* `-`, `-l`, `--login`: Start the shell as it was a real login
## 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
```
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