1. Linux file system structure: tree structure
/--root directory (unique)--bin:binary is short for binary, which stores some system-level command files;
--dev:(device), device, can mount some other devices;
--home:home, yes The user's home directory, if there are multiple users, each user will be stored in the form of a directory under the home;
--media: can store some video and other files
--mnt: mainly mount CD-ROM, U disk and other devices;
- -opt: The installation location where other foreign software is stored;
--root: is the directory of the super administrator of the system;
--user: occupies most of the hard disk space, and almost all operations used by users are here;
-- boot: the core file to start the system;
--etc: stores configuration files, such as network configuration files;
--lost+found: stores damaged files when the system crashes;
--lib: resources required by the system library;
do not modify the above files as much as possible;
Second, the Linux system is a file and directory (folder):
Permission problem: When viewing the details of the file, there will be permission display:type owner
0 123 456 789 ---- file
d rwx rx rx ---- abrt
The first character indicates the file type:
-: ordinary file Identifier
d: directory identifier
l: link file identifier
The second to fourth characters represent the owner of the file (usually the creator)
r: readable owner
w: writable
x: executable
The fifth to the first Seven characters represent the permissions of the user group (group), and the
eighth to tenth characters represent the permissions of other groups (other)