Execute shell script everytime a new user is created

Question

What would be the easiest way to execute a command everytime a new user is added?

I checked through /etc/adduser.conf but nothing is in there which looks li

Answer 1

From man adduser:

   If  the  file  /usr/local/sbin/adduser.local exists, it will be exe‐
   cuted after the user account has been set up  in  order  to  do  any
   local setup.  The arguments passed to adduser.local are:
   username uid gid home-directory

Looks like you can add your user-creation actions here.