echo—echoes arguments

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