Linux and Unix echo command
Echo's to the screen what you type after echo. Echo is useful for producing diagnostics in command files, for sending known data into a pipe, and for displaying the contents of environment variables.
echo [-n] text
|-n||On BSD and some variants derived from BSD does not begin a new line after the echoed text.|
|text||The text that you want to echo to the screen.|
echo Hello world
The above example would return "Hello world" to the console
echo * | wc
The above example would list a count of all the files and directories in the current directory.