Simple Script to Create Users on CentOS 6.5

Simple Script to create a user.
Default passwd is set as username@123

As we are setting the chage, user needs to change the passwd on first login.

usage() {
  echo -e "
usage: $0 
  Optional parameters:\n
     --sudo-user, -s\t\tCreate a sudo User
     --norm-user, -n\t\tCreate a Normal User.
     --help,      -h\t\tDisplay this Message.
  "
  exit 1
}

create_normal_user()
{
    USRNAME=$1
    # create user
    useradd $USRNAME
    echo ${USRNAME}@123 | passwd ${USRNAME} --stdin

    # make sure user changes his passwd on first login
    chage -d 0 ${USRNAME}
}

create_sudo_user()
{
    SUDO_USRNAME=$1
    create_normal_user ${SUDO_USRNAME}
    echo -e "${SUDO_USRNAME}\tALL=(ALL)\tALL" >> /etc/sudoers
}

while true ; do
  case "$1" in
    -s)
      create_sudo_user $2
      exit 1
      ;;
    -n)
      create_normal_user $2
      exit 1
      ;;
    --sudo-user)
      create_sudo_user $2
      exit 1
      ;;
    --norm-user)
      create_normal_user $2
      exit 1
      ;;
    -h)
      usage
      exit 1
      ;;
    --help)
      usage
      exit 1 
      ;;
    *)
      echo "Unknown option: $1"
      usage
      exit 1
    esac
done

​