System Administration Guide
Appendix C, UNIX directories and special device files

The root directory

The root directory

The root directory (/) contains these system directories:

/bin
UNIX command directory

/dev
device special directory

/etc
additional program and data file directory

/lib
C programming library directory

/mnt
mount directory -- reserved for mounted filesystems

/opt
location of shared software storage object files

/shlib
shared libraries

/stand
filesystem containing the kernel and boot files

/tcb
TCB (Trusted Computing Base) security binaries and databases

/tmp
temporary directory (reserved for temporary files created by programs)

/usr
user service routines -- may contain user home directories

/var
location of non-shared software storage object files