Introduction to the meaning of file attributes in Linux operating systems

The first attribute represents the file as "directory, file or link file, and so on":

When [d] is a directory, such as line 11th of the table above;

When a [-] is a file, for example, line 5th of the table above;

If [l] is a link file;

In the case of [b], the peripheral equipment that is available for storage in the device file;

If [C] is the serial port device inside the device file, such as keyboard, mouse.

In the next attribute, three is a group, and all of the three parameters of "rwx" are combined. where [R] stands for readable (read), [W] for writable (write), [x] for executable (execute):

The first group is "authority of the owner" and, in the 5th Act, the owner of the file can read, write, but not execute;

The second group is "permissions of the same group";

The third group is "other non-this group's permissions".