UNIX system directories

/

the source of the file system (called the root directory)

/stand

contains programs and data files used in the booting process

/sbin

contains essential executables used in the booting process and in manual system recovery

/dev

contains special files that represent peripheral devices, such as:

console	console
lp	line printer
term/	user terminal(s)
dsk/	disks

/dev/fd

contains files accessible through file descriptors

/etc

contains machine-specific administrative configuration files and system administration databases

/home

the root of a subtree for user directories

/tmp

contains temporary files, such as the buffers created for editing a file

/var

the root of a subtree for varying files such as log files

/usr

contains other directories, including lib and bin

/usr/bin

contains many executable programs and utilities, including the following:

   cat
   date
   login
   grep
   mkdir
   who

/usr/lib

contains libraries for programs and languages

/proc

contains files which provide access to the image of each active process in the system