I really needed an adduser like program on MacOSX  and after a few searches on the internet I found a script that works like the linux adduser program.

I remember I had to modify it to use bash ( my preferred shell ) as the default shell and I make it use the right path when copying the user template. I can't remember exactly where I found it so if you have seen this someplace else feel free to let me know and I'll be happy to give credit.

Here it is :