bin:short for binary executable file, save common command binary files, all users can execute
sbin: executable binary. super binary. Only root user can execute
boot: boot directory, including unix kernel files
dev: short for device . Save all hardware devices on the computer. In Linux, all hardware is abstracted into a file
etc: All OS related configuration files.
home: Save the user's data, documents, etc. There is no user in the operating system, and there will be a folder named after the user in the home folder.
The root user's files are not in the home folder, there is a separate root folder.
lib: linux runtime library file
media: for automatic mounting, U disk, etc., not all operating systems have it.
mnt: for mounting, all operating systems have it, which can be equivalent to media
opt: used to install some large software.
proc: some real-time information of the system, which does not exist on the hard disk, but exists in the memory
sys: system bottom operating information, including some low-level hardware information
tmp: temporary directory, will be automatically deleted
usr: save the application software we installed, the general software is installed in usr by default, and the large ones are installed in opt
var: Save some information that changes frequently, such as log (system log)