Write each string to standard output, separated by spaces and terminated by a newline. If no strings are supplied, echo a newline. (See also echo in Chapter 3.)
Enable interpretation of escape characters:
Suppress the terminating newline (same as -n)
The character in the ASCII set corresponding to the octal number nnn.
The character in the ASCII set corresponding to the hexadecimal number nn (1 or 2 hex digits).
Do not append a newline to the output.
Disable interpretation of escape characters.