I presume you are asking how to customize your terminal.
 
Certain terminals allow for customizing and others don't. I'm not aware of options to customize xterm. Rxvt, eterm, konsole, gnome-terminal and my favorite, aterm are cutomizable. For a list of options, open a terminal and enter the command of your favorite terminal followed by:
 
--help [enter]
 
As in:
 
aterm --help
 
look for the options you want and give them a try. Aterm is very versatile in this way. If you have aterm, enter the below command on your box to see how I've got mine set.
 
aterm -tr -bg black -fg white -trsb -sh 50% -tint white -ls -cr purple
 
hope this helps..

 

Thanks,
but it's not exactly what i want,
really i want to have different colors for all
different characters...
ie, i want something like this..
 
char 'c' is blue
char 'z' is red
char 't' is green
...
...
 
and also for whole characters, can i do this ?
if i can, how?
thanks again..
 
fox(atk)
 
 

I'm afraid I wouldn't know how to do that. Sorry.

I remember the admin on a bios site that I used to be on wrote a howto on this. It was very good, but alas, is now gone.
 
But, you may want to look at the following Bash how-to