Filesystem

Deprecations

No /boot/efi
No /etc/mtab; succeeded by /proc/mounts
No /lib32; pure 64-bit system
No /lib64; pure 64-bit system
No /run/shm; succeeded by /dev/shm
No /run/tmp; only useful for embedded systems on Debian
No /usr/com; succeeded by /var/lib
No /var/db; a BSD relic that was succeeded by /var/lib

Compatibility Symlinks

/bin as a symlink to /usr/bin
/lib as a symlink to /usr/lib
/sbin as a symlink to /usr/bin
/usr/libexec as a symlink to /usr/lib
/usr/sbin as a symlink to /usr/bin
/usr/share/pkgconfig as a symlink to /usr/lib/pkgconfig
/var/lock as a symlink to /run/lock
/var/run as a symlink to /run
/var/spool/mail as a symlink to /var/mail
Sticky bit (1777) is set on /dev/shm, /tmp and /var/tmp (and /var/mail?)

References