The code `echo 'test'` outputs the string "test" to the...

The code echo 'test' outputs the string "test" to the terminal or console. The echo command is a shell builtin command that prints its argument(s) to standard output (usually the terminal). In this case, the argument is the string "test", which is enclosed in single quotes to indicate that it should be treated as a literal string and not interpreted as a command or variable reference.