This week: Linux File Permissions

To maintain proper security, users should have exactly the level of access that they need to do their jobs — no more, no less. That's why knowing how to manage and maintain file permissions is an understated, but incredibly important, skill. Knowing when to chmod versus chown or use a uid or gid is all part of the job.

This week, we give you a crash course in Linux permissions, executables, and the fundamentals of uid and gid.

Umask File Permissions: A Crash Course

When it comes to administering and securing Linux environments, understanding umask and file permissions is crucial. Learn how both these factor into Linux security.

Linux File Permissions: Understanding setuid, setgid, and the Sticky Bit

Setuid and setgid are a way for users to run an executable with the permissions. Learn why they are so crucial and Linux admins can leverage them.

Linux File Permissions: uid vs gid

User identifier (uid) and group identifier (gid) are fundamental concepts that any Linux system administrator needs to know. Learn what they do and how they play a role in file permissions.