echo [ argument ] ... echo [ n ] [ argument ]
echo writes its arguments separated by blanks and terminated by a newline on the standard output.
System V echo options:
\b
backspace
\c
suppress newline
\f
form feed
\n
newline
\r
return
\t
tab
\v
vertical tab
\\
backslash
\0n
n is a 1, 2, or 3, octal value