Display message on screen, writes each given STRING to standard output, with a space between each and a newline after the last one.
echo [options]… [string]…
Do not output the trailing newline.
Disable the interpretation of the following backslash-escaped characters
Enable interpretation of the following backslash-escaped characters in each STRING:
“a” alert (bell)
“c” suppress trailing newline
“e” escape “f” form feed
“v” vertical tab
“NNN” the character whose ASCII code is NNN (octal); if NNN is not a valid octal number, it is printed literally.
“xnnn” the character whose ASCII code is the hexadecimal value nnn (one to three digits)echo is a BASH built-in command