About Linux Users

  • Users and Groups are used to control access to files and resources.
  • Users login to the system by supplying their username and password.
  • Every file on the system is owned by a user and associated with a group.
  • Every process has an owner and group affiliation and can only access the resources owner or group can access.
  • Every user of the system is assigned a unique user ID number.
  • User name and UID are stored in /etc/passwd.
  • Users password is stored in /etc/shadow in encrypted format.
  • Users are assigned a home directory and program that is run when they login.
  • Users cant read, write or execute each others files without permissions.
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