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Users & Access🔗

Every operation on a Linux system is governed by three things: who you are, what group you belong to, and what the file allows. The two articles here cover both sides of that equation — the permission model itself, and the identity system behind it.

  • File Permissions

    Read the rwxr-xr-x strings, change permissions with chmod, and understand the difference between symbolic and octal notation — and when each is right.

  • Users and Groups

    Add users, manage groups, switch identities with sudo and su, and understand how Linux maps identity to access at runtime.

What's Next🔗

With permissions and identity in hand, the next step is working with data. Head to Text & Pipelines — the Linux tools for filtering, routing, and searching the output of any command.