I found nothing helpfull for this question. There is still the list of Unix commands, where I did only small additions and which is nearly half the lines of code.
When in doubt, I think it is better to stick to the rules. So I would like to keep it LGPL.

In D20233#444099, @cullmann wrote:

Thanks for the contribution.
On a first glance, that looks ok, no hard coded colors, test case, ...
We would prefer if the license would be MIT, is that possible?