#! /bin/sh

PASSWDFILE=./passwd
GROUPFILE=./group

# function to show usage
usage () {
  echo Usage: `basename $0` [-l login] [-c crypt] [-u uid] [-g gid] [-n gecos] [-h homedir] [-s shell] [-f]
}

# Parse the command-line arguments first
while getopts l:c:u:g:n:h:s:f arg
do
  case $arg
  in
    l) login=$OPTARG ;;
    c) crypt=$OPTARG ;;
    u) uid=$OPTARG ;;
    g) gid=$OPTARG ;;
    n) gecos=$OPTARG ;;
    h) home=$OPTARG ;;
    s) shell=$OPTARG ;;
    f) force="true" ;;
    *) usage; exit 1 ;;
  esac
done

# Login name has no default---must be specified
if [ -z $login ]
then
  if [ $force ]
  then
    echo "Login name must be specified"
    exit 2
  fi
  echo -n "Login: "
  read login
fi

if [ -z $crypt ]
then
  crypt=x
  if [ ! $force ]
  then
    echo -n "Crypt (default=$crypt): "
    read tmp_crypt
    test "$tmp_crypt" != "" && crypt=$tmp_crypt
  fi
fi

if [ -z $uid ]
then
  uid=`cut -d: -f3 $PASSWDFILE | sort -n | uniq | awk '$1 >= 10000' | \
     awk 'BEGIN { last = 9999 } $1 != ++last { print last; exit }'`
  if [ ! $force ]
  then
    echo -n "UID (default=$uid): "
    read tmp_uid
    test "$tmp_uid" != "" && uid=$tmp_uid
  fi
fi

if [ -z $gid ]
then
  gid=`grep users $GROUPFILE | cut -d: -f3`
  if [ ! $force ]
  then
    echo -n "GID (default=$gid): "
    read tmp_gid
    test "$tmp_gid" != "" && gid=$tmp_gid
  fi
fi

if [ -z $gecos ]
then
  gecos="No Name"
  if [ ! $force ]
  then
    echo -n "Gecos (default=$gecos): "
    read tmp_gecos
    test "$tmp_gecos" != "" && gecos=$tmp_gecos
  fi
fi

if [ -z $home ]
then
  home="/home/$login"
  if [ ! $force ]
  then
    echo -n "Home (default=$home):  "
    read tmp_home
    test "$tmp_home" != "" && home=$tmp_home
  fi
fi

if [ -z $shell ]
then
  shell="/bin/sh"
  if [ ! $force ]
  then
    echo -n "Shell (default=$shell): "
    read tmp_shell
    test "$tmp_shell" != "" && shell=$tmp_shell
  fi
fi

if [ ! $force ]
then
  echo "-> $login:$crypt:$uid:$gid:$gecos:$home:$shell <-"
  echo -n "Add this line to $PASSWDFILE? (y/n): "
  read ans
else
  echo "Adding: $login:$crypt:$uid:$gid:$gecos:$home:$shell"
  ans=y
fi

if test "$ans" = "y"
then
  echo "$login:$crypt:$uid:$gid:$gecos:$home:$shell" >>$PASSWDFILE
else
  echo "$PASSWDFILE unchanged"
fi