UNIX directories and special device files

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