"coreutils" refers to the GNU core utilities, which are the basic set of file, shell, and text manipulation utilities that are expected to be installed on every UNIX-like operating system.

The coreutils include a fairly wide range of commands that apply to many situations. In this section we will focus on just a few of the more common commands that are used for working with text files:

Basic commands that are used for viewing and summarizing file content
File Modification
Commands that are used for modifying files, such as sorting them.