Install file by entering the following commands in the terminal:
sudo apt update sudo apt install file
Description:
Recognize the type of data in a file using "magic" numbers
The file command is "a file type guesser", a command-line tool that tells you in words what kind of data a file contains. . This package contains the file program itself.
Homepage: http://www.darwinsys.com/file/
Version: 1:5.32-2
Section: utils