What does the command 'echo' do?

The command 'echo' is primarily used to print text or output to the terminal. When you enter a command that includes 'echo', followed by text or a variable, it displays that information directly on the screen. For example, typing echo "Hello, World!" will result in "Hello, World!" being shown in the terminal. This is useful in scripts and command line operations for providing user feedback, displaying variable values, or simply outputting messages.

The other functions listed in the choices relate to different commands in the Linux environment. For instance, displaying the contents of a file is accomplished with commands like 'cat' or 'less', copying files involves the 'cp' command, and creating a new directory is done with 'mkdir'. Each of these has a distinct purpose, but 'echo' specifically focuses on outputting text to the terminal.