echo linux flags
-n
Do not output a trailing newline.
-E
Disable the interpretation of the following backslash-escaped characters.
-e
Enable interpretation of the following backslash-escaped
characters in each String:
\a Alert (bell)
\b Backspace
\c Suppress trailing newline
\e Escape
\f Form feed
\n New line
\r Carriage return
\t Horizontal tab
\v Vertical tab
\\ Backslash
\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 hex value nnn (1 to 3 digits)