What does the 'echo' command do?

The echo command in Unix-like and Windows operating systems is used to output text strings or variable values to the standard output (usually the console or terminal).

Examples of usage:

• // Output the string "Hello, World!"
  echo "Hello, World!"
  

• // Output the value of the environment variable PATH
  echo $PATH
  

• In Windows:

  // Output the string "Hello, World!"
  echo Hello, World!