To add new user use
ncsa_auth <passwordfile> -a username password
To del user delete string from passwordfile

Usage of special symbols in user name and password:
Under FC '!' has special meaning, use double "!!" as single "!"
   
  ncsa_auth passwd   -a user pass!!wd

CMD use |, > and  < as input/output redirection , so you can use smth 
like 

  ncsa_auth passwd   -a user2 "pass<"
