# 2.5 Root User

There is always an ultimate user "_root_" in Linux, who has the right to do everything. Since the password is not yet set for "root", it is impossible to login in as root. However, a "sudoer" user, which is "student" in our case, may upgrade itself to "root" via the command `sudo`: execute`$ sudo su`followed by entering the password of "csci3150". Note that the ending character of the command prompt changes from`$`to`#`after`sudo`. To downgrade yourself back to "csci3150", execute `exit`. Also you can use a shortcuts `Ctrl`+`D`&#x20;

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