A succession of user rating, or a Clas software in command-line operating systems Unix and Unix-like that to users, it lets applications on behalf of another user —without leaving current user from the system— run. The target user is usually the user's main operating system, or root user (root user), which is, of course, can any other users as well. Of the common use of this command in the implementation of the program and the command that requires the level of access of the user root? such as install software, change in the file system, and the more records that are in subdirectories, important operating system. Allow access to the command Clas only to users given previously for the system defined. This group of users "", sudoers), are called and edit the file sudoers in the path /etc can be settings related to editing ... which, of course, edit this file, your are subject to having the user access the root. At more distribution, let the run command Clas to all users by default is given.

After running the command, sudo of the user, the password will be asked, which in the default mode, and when a getaway to the space user root, password is an. Although you can edit the file sudoers is in the path /etc., and with the addition of %sudo ALL=NOPASSWD: ALL of the password request block. Use the parameter -i and insert the password, the system to the virtual account of the user root. and also with the parameter -u user can enter a user's account was (user Name target user is), and orders that only the target user is allowed to run, it is run, or to the subfolder personal it user.