#!/bin/bash
#set -x

#Usage
if [ $# -ne 1 ]
then
 echo "Usage : createuser.sh [FILE]"
 exit 2
fi

#read file  $1 and add users
while IFS=: read user name password groupe ; do
 echo  "Verify username : $user "
 verif=$(cut -d : -f1 < /etc/passwd | grep $user)
 if [ "$verif" != "$user" ]
 then
  #group GID
  gid=$(cat /etc/group | grep $groupe | cut -d : -f 3)
  #last userID, our user is : lastID+1
  lastID=$(tail -1 /etc/passwd | cut -d : -f 3)
  userID=$(($lastID+1))
  echo "$user's id is : $userID "
  #Creat user directory
  echo "Creating user directory"
  mkdir /home/$user
  #add user to /etc/passwd
  echo "Adding User to  /etc/passwd"
  echo "$user::$userID:$gid:$name:/home/$user:/bin/bash >> /etc/passwd
  #add user to /etc/shadow
  # i have a question about the numbers in the syntax
  echo "$user::8678:3:120:7:30:9500: >> /etc/shadow
  #Creat password
  echo "$user:$password" | chpasswd -m
  #copy  skel dir to home dir
  cp -r /etc/skel/ /home/$user
  #Set permissions
  chown -R $user /home/$user
 else
  echo "User alreay exists"
  exit 3
 fi
done < $1