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Article:
  Installing XFree86 on Mac OS X
Subject:   Superuser command
Date:   2002-11-29 19:41:03
From:   anonymous2
The command should be "su", not "sudo" - and the word "root" is not necessary. Sudo will let you execute one command as root - useful for editing a file through sudo vi or similar. Su will practically login as root, opening a new shell (tcsh, normally) that can be closed as root. Su <username> will change to username's account.