Directory structure

The root directory (/) is the top-level directory in the file system hierarchy. It is the parent directory for all other directories on the system. Here are some common directories found within the root directory:

Root directory	Description
/bin	binary: conatins binaries essential to the OS
/etc	etcetera: contains configuration files for the system and installed applications
/sbin	system binary: binary accessible only from the sudo user
/usr	user directory, contains files (binaries/libraries/shared files/manuals) non essential to the OS
/usr/local	contains manually managed files, hence without using a package manager
/boot	contains files needed for booting the system, such as the kernel and boot loader.
/dev	device files, contains device files, which represent hardware devices on the system
/opt	optional
/tmp	temporary files, contains homonymous files
/var	variable, contains log and system generated file
/lib	library, contains essential library files.
/procs	virtual folder created by the kernel to take trace of the running process