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How do I log in as the root user under Linux / UNIX operating system?

April 26, 2017linux log operating system Unix user

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How do I log in as the root user under Linux / UNIX operating system?

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A. Under Linux, UNIX and *BSD root user act as superuser. Root user is the conventional name of the user who has all rights or permissions. The root user can do many things an ordinary user cannot, such as changing the ownership of files, mounting disk, formatting and restating new file system and binding to ports numbered below 1024 etc (see Supperuser/Rootuser at wikipedia).