The same way as you would in DOS.
https://www.google.ca/search?q=change+dos+text+color

thx for the answer, but no. i looked that way too. but i didn't find anything on the whole web. thx for trying to help me.

I don't think you're looking closely enough.
White screen

You will also probably need the EGA color table.
https://en.wikipedia.org/wiki/File:EGA_Table.PNG

Add this at the beginning of DOSBox autoexec:

1@echo esc[32m

or light green:

1@echo esc[1;32m

Replace "esc" with the escape character.

Somewhere I found that the escape character in DOS would be "$e", so I inserted

1@echo $e[32m

in the autoexec section of the DOSBox cofiguration file, but that doesn't work (no color change).

I found examples for DOS which use "prompt" instead of "@echo", but it seems the prompt command is not available in DOSBox.

Any other ideas?

The esc-character is a special character that you can't type "normally". You can type it in some text editors by holding the Alt-key and typing the character code number with the keypad keys. (I don't remember what the number is).

Copy & pasting doesn't necessarily work either (different encoding etc.) and it seems it can't be pasted here on this forum at all.

EDIT: The code for esc is 027. Works for example in Notepad++ (you get a black square that has the letters "esc" inside it).
Hold down Alt, type 027 on the numpad, release Alt.

Press and hold ALT key, type 27 on keypad, release ALT key. 😀

Thanks zirkoni and ripsaw8080, this worked!

Hobbyist wrote:

Somewhere I found that the escape character in DOS would be "$e"

I found examples for DOS which use "prompt" instead of "@echo"

$e is interpreted as escape code by prompt (in MS-DOS), but not by echo.
prompt has also the advantage of automatically resetting the colors each time you exit a program (which might've mangled your customized colors).

This turns everything green - Verde Phosphor emulator
http://www.abadiadelcrimen.com/verde.html

Wow that cool! Didn't even know you could!

Sadly I've not been able to get my prompts to change colors in the ECE releases of Dosbox but could quite easily on the old DaumSVM version I also still have on hand. I will have to take a look at this to see if the command structure between the two versions is different somehow, but I originally was using the .cfg from my daum version when I first tried using the ECE versions.