ANSI escape sequences.

FOREGROUND COLORS
-----------------
<escape>[30m  = BLACK                    <escape>[31m = RED
<escape>[32m  = GREEN                    <escape>[33m = YELLOW
<escape>[34m  = BLUE                     <escape>[35m = MAGENTA
<escape>[36m  = CYAN                     <escape>[37m = WHITE

BACKGROUND COLORS
-----------------
<escape>[40m  = BLACK                    <escape>[41m = RED
<escape>[42m  = GREEN                    <escape>[43m = YELLOW
<escape>[44m  = BLUE                     <escape>[45m = MAGENTA
<escape>[46m  = CYAN                     <escape>[47m = WHITE

ATTRIBUTES
<escape>[5m   =  BLINK
<escape>[7m   =  REVERSE
<escape>[1m   =  BOLD
<escape>[4m   =  UNDERLINED (IBM Monochrome only)
<escape>[0m   =  NORMAL (Cancels colors and attributes)


CURSOR POSITIONING
<escape>[r;cH =  Position cursor at row r and column c
                 (i.e. to position cursor at row 12 column 40 you would 
                  send the code <escape>[12;40H )
n = number

<escape>[nA  =  Move cursor ## lines up in same column
<escape>[nB  =  Move cursor ## lines down in same column
<escape>[nC  =  Move cursor right ## columns on same line
<escape>[nD  =  Move cursor left ## columns on same line
<escape>[0K  =  Erase cursor to end of line
<escape>[1K  =  Erase from beginning of line to cursor
<escape>[2K  =  Erase entire line containing cursor
<escape>[0J  =  Erase from cursor to end of screen
<escape>[1J  =  Erase from beginning of screen to cursor
<escape>[2J  =  Erase entire screen


Command stringing is allowed.  For example, to change the screen to
bright yellow foreground on a blue background you would send the code:

                     <escape>[0;1;33;44m

Explanation:
             <escape>[ = initialization sequence
                0      = reset to normal characters
                1      = set for bold characters
               33      = set for yellow foreground characters
               44      = set for blue background characters
                m      = terminator