How to determine file types under Linux

There are a total of 7 file types under Linux, namely:

Normal file (-)

Catalog file (d),

Soft link file (l) = shortcut,

Block device file, binary file (b)

character device file (c)

Socket file (s)

Pipeline file (p)

Common file types are: Normal files, directory files, and soft link files

System special file types are: Block device files, character device files, socket files, pipe files.

How do I determine the file type?

Using the command in the current directory: Ls-l, you can list all the files in that directory, and the first letter of the first column contains the file type of the file:

The first column is 10 bits long, except that the first bit is used to represent the file type, and the other 9 bits are divided into a group of 33 bits, each representing the permissions of the file, so you can know that the permissions of the file are divided into three categories: Owner (U), owning Group (g), others (O);

When you use the LS-A command, you will find that some filenames have " . " When it represents the file as a hidden file

Use of LS:

How to determine file types under Linux