Escape Codes

Not strictly ANSI, but that's the name that always comes to mind when I want to look this stuff up.

Colour

\033[n;km

Where n is a colour number, and k is a format code.

Color table#cite_ref-3^[4]
Intensity	0	1	2	3	4	5	6	7	9
Normal	Black	Red	Green	Yellow#cite_ref-4^[5]	Blue	Magenta	Cyan	White	reset
Bright	Black	Red	Green	Yellow	Blue	Magenta	Cyan	White

#graphicsSGR (Select Graphic Rendition) parameters
Code	Effect	Note
0	Reset / Normal	all attributes off
1	Intensity: Bold
2	Intensity: Faint	not widely supported
3	Italic: on	not widely supported. Sometimes treated as inverse.
4	Underline: Single
5	Blink: Slow	less than 150 per minute
6	Blink: Rapid	MS-DOS ANSI.SYS; 150 per minute or more
7	Image: Negative	inverse or reverse; swap foreground and background
8	Conceal	not widely supported
21	Underline: Double	not widely supported
22	Intensity: Normal	not bold and not faint
24	Underline: None
25	Blink: off
27	Image: Positive
28	Reveal	conceal off
30–39	Set foreground color, normal intensity	3x, where x is from the color table above
40–49	Set background color, normal intensity	4x, where x is from the color table above
90–99	Set foreground color, high intensity	aixterm
100–109	set background color, high intensity	aixterm

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If 88- or 256-color support is compiled, the following apply.
3 8 ; 5 ; Ps 	Set background color to Ps
4 8 ; 5 ; Ps 	Set foreground color to Ps