0 Reset all attributes
1 Bright/Bold
2 Dim
4 Underscore
5 Blink
7 Reverse
8 Hidden
30 Black
31 Red
32 Green
33 Yellow
34 Blue
35 Magenta
36 Cyan
37 White
40 Black
41 Red
42 Green
43 Yellow
44 Blue
45 Magenta
46 Cyan
47 White
$ export GREP_COLOR='1;30;43'means Bright/Bold (1) black (30) text and yellow (43) background
