Outout in Colors 
iDog
We can print strings in colors by using escape sequence:
echo "^[[0;36;40mXXXXXX^[[0m"
Notes:
-  "^[[" contains two characters: an Esc (press <Ctrl>-V, then Esc key), and a '['.
 -  We need to 'close' the color instruction by ending with "^[[0m", otherwise the color is to be used in all the terminal.
 
Syntax:
^[[<attr>;<fore_color>;<back_color>m
If any of the above three values is omitted, then the default value is used.
Attributes
| Value | Meaning | 
| 0 | Reset All Attributes (return to normal mode) | 
| 1 | Bright (Usually turns on BOLD) | 
| 2 | Dim | 
| 3 | Underline | 
| 5 | Blink | 
| 7 | Reverse | 
| 8 | Hidden | 
Foreground colors
| Value | Meaning | 
| 30 | Black | 
| 31 | Red | 
| 32 | Green | 
| 33 | Yellow | 
| 34 | Blue | 
| 35 | Magenta | 
| 36 | Cyan | 
| 37 | White | 
Background colors
| Value | Meaning | 
| 40 | Black | 
| 41 | Red | 
| 42 | Green | 
| 43 | Yellow | 
| 44 | Blue | 
| 45 | Magenta | 
| 46 | Cyan | 
| 47 | White |