echo [-eEn] [
Write string to standard output. (See also echo in Chapter 3.)
Enable interpretation of the following escape sequences, which must be quoted (or escaped with a \) to prevent interpretation by the shell:
Alert (ASCII BEL).
Suppress the terminating newline (same as -n).
ASCII Escape character.
ASCII character represented by octal number nnn, where nnn is zero, one, two, or three digits and is preceded by a 0.
ASCII character represented by octal number nnn, where nnn is one, two, or three digits.
ASCII character represented by hexadecimal number HH, where HH is one or two hexadecimal digits.
Do not interpret escape sequences, even on systems where the default behavior of the built-in echo is to interpret them.
Do not print the terminating newline.
echo "testing printer" | lp$
echo "Warning: ringing bell \a"