Multi-user Linux system capabilities are of fundamental importance: all user actions are possible only after the identification of the user with any of the records. Linux allows users to defined his rights to work with files and directories. It is believed that each file belongs to a particular user and a particular group of users. Each file is also associated rights table indicating which actions (read, write, program execution, opening the catalog and some others) can take the file's owner, a member of the group that owns the file, and an arbitrary user. In addition to records of ordinary users, there is also the root login account with a reserved name root. The super-user can perform any legal action on any file, regardless of who owns it and what is the right table of the file. In addition, the superuser can change the owner information of any file and its rules table. A root also has a much more extensive rights not associated with file operations.

Since the initial way to get root on most phones was through a terminal session, launched by the command "adb shell", the most correct way, in my opinion, is this:
a) Make sure that USB debugging is enabled: "Configuring the Application Developing USB Debugging";
b) connect the phone to the BB and execute the "adb shell" [Enter] on the command line;
c) if the system prompt looks like "#", then skip paragraph "d" and go to paragraph "d";
d) if the system prompt looks like "$", then on the command line type "su" [Enter]. After that, the system prompt should change to "#". Not changed - try "/ system / bin / su", "/ system / sbin / su" or "/ system / xbin / su". If you still see - "$", then you most likely do not have root-rights;
e) type in the command line "/ system / bin / id" [Enter]. If we see in response - "uid = 0 (root) gid = 0 (root)", then we are happy - the phone is rooted.

A similar test can be done through a terminal emulation program, which must be run (after setting if it does not exist) in the phone. Running, begin to act with n. "In." The essential difference is that in Step. "G" may be prompted to privilege escalation. Or it may not appear. If there was - answer "Allow". The invitation should be replaced with "#". If the request does not appear, then there are two possibilities: either the program "Superuser" is already installed or not. If you see the response "permission denied" system (permission denied), then the "Superuser" is not installed. Install it. If it is not set (or set, but is not functioning properly) - root phone is offline. A curtain.

If the program "Superuser" has already been established earlier, then there are also two options: terminal emulator allowed to run as root or vice versa is prohibited. If allowed, we should immediately see a welcome symbol "#". If smoking - launching a "Superuser" and remove the ban by removing the record of our terminal. We go back to the terminal and repeat the "su" [Enter], waiting for a request for privilege escalation, resolution increase, see "#". With trembling hands, type in the terminal "id" [Enter]. We analyze it.