What does the 'echo' command do?

The 'echo' command is used in Linux to output text or the values of variables to the terminal. When you use 'echo' followed by some text or a variable, it will print that text or value to the standard output, which is usually the terminal screen. This command is particularly useful for displaying messages, debugging scripts, and checking the values of variables during script execution.

For example, if you run echo "Hello, World!", the terminal will display "Hello, World!" as the output. Similarly, if you have a variable and you want to see its value, you can use 'echo' followed by the variable name prefixed with a dollar sign (e.g., echo $my_variable), which will display the current value stored in 'my_variable'.

The other options do not accurately represent the function of the 'echo' command. Creating a new file or deleting text does not align with the purpose of 'echo', nor does it specifically deal with displaying error messages. 'Echo' is focused solely on outputting text and variables, making it a fundamental command for interacting with users in scripts and commands.