#!/bin/bash
# Add user to Samba

USER=${1}
GROUP=repositorio

if [ -z ${1} ]; then
  printf "Use: addsmbuser [username]\n"
  exit 1
fi

if [ ! $(grep ${1} /etc/passwd) ]; then 
  /usr/sbin/useradd ${1} -n -s /sbin/nologin -g ${GROUP}
else
  printf "User exist in /etc/passwd\n"
fi

/usr/sbin/smbpasswd -a -e ${1}

exit $?

Permisos: chmod 700 addsmbuser.bash 

Ejecución: ./addsmbuser.bash [ nombre de usuario ]