We see here that the
echo command can print to the standard output (usually the terminal) whatever we pass to it as an argument:
$ echo Hello! Hello! $
How do we practically utilize this command?
Let’s keep in mind here that the value of the command line functions is not only that we can use them in the terminal, but that we can write programs, called shell scripts, with them.
echo command plays the same role as the print function in other languages. Along with printing common strings, “Hello!”, we can print the values of environmental variables to the standard output with
echo. For example
echo $PATH, will print the value of
PATH: your search path. In this way,
echo is as practical as any other print function.