Chapter 5. System Security and File Permissions

Terms you'll need to understand:

  • Superuser account

  • User and group accounts

  • /etc/passwd, /etc/shadow, and /etc/group file formats

  • Absolute and symbolic access modes

  • Access Control List (ACL)

Techniques you'll need to master:

  • Restricting and monitoring the superuser account

  • Changing default and existing file permissions

  • Setting and displaying Access Control Lists

  • Changing file ownership

This chapter covers system security and file permissions. In particular, system security involves controlling access to the system by use of passwords and restricting/monitoring the use of administrative user accounts. The file permissions portion of the chapter addresses controlling access to the data in files by using ...

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