Similar to UNIX_System_III

Udev

UNIX System V

The UNIX-HATERS Handbook

Unix-like

Unix wars

List of POSIX commands

X Window System

XFS

Xinetd

ZFS

Interix

Open system (computing)

Virtual console

Pseudoterminal

Getty (software)

Shell (computing)

Shell account

Shebang (Unix)

Sticky bit

Daemon (computing)

Unix philosophy

Device file

Network Information Service

Pipeline (Unix)

Hacker culture

Hard link