Similar to 2001年9月9日問題

Network File System

Nm (Unix)

IBM High Availability Cluster Multiprocessing

Procfs

Setuid

Single UNIX Specification

STREAMS

Termcap

Terminfo

Tz database

Udev

UNIX System III

UNIX System V

The UNIX-HATERS Handbook

Unix-like

List of POSIX commands

X Window System

XFS

Xinetd

ZFS

Interix

Virtual console

Pseudoterminal

Getty (software)

Shell (computing)