example1:password1:group1:fullname1
example2:password2:group2:fullname2
slick:ghost:users:Slick
username:password:group:Full name

#!/bin/bash
# Author: Joshua Bailey
# Script: multiUserAdd
# Summary: Adds multiple users from a
#      specified file.
# Syntax: multiUserAdd <fileToAddFrom>
# Syntax of fileToAddFrom: "UserName:Password:GroupName:FullName"

if [[ ! `id -u` = 0 ]]
then
   echo "*** Error:: you must be root to use this ***"
   exit
fi

if [[ ! $# > 0 ]]
then
   read -p "Please enter the file you want to use (/path/to/filename): " fileTo

elif [[ $# == 1 ]]
then
   fileTo=$1
fi

if [[ ! -e $fileTo ]]
then
   echo "*** Error:That file does not exist! ***"
fi

((recCount=0))

# until there are no more records in the file
# loop
until ! read Record
do
   ((recCount++))
   errorFlag=n

   # put each line into a file called tempRecord
   # it gets written over ever instance of the loop
   echo $Record > tempRecord

   # cut up the record within the file at each instance
   # assign each variable the part you chopped
   group=`cut -d: -f3 tempRecord`
   name=`cut -d: -f4 tempRecord`
   password=`cut -d: -f2 tempRecord`
   un=`cut -d: -f1 tempRecord`
   
   # some very very basic validation checking (not finished)
   if [[ ${#group} == 0 ]]
   then
      errorFlag=y
      echo "*** Error:Missing group for record $recCount ***"
      errorMsg="$errorMsg:missing group"
      #echo "Record $recCount:$Record - Missing group" >> errorReport
   else   

      # see if the group exists...if not create it
      # first seperate the groups from the group file
      cut -d: -f1 /etc/group > tempGroup
   
      # check each group to see if it matches the group we want
      until ! read Record
      do
         # if the group matches what we want...set our flag
         if [[ $Record != $group ]]
         then
            gmflag=1
         else
            gmflag=0
         fi

      done < tempGroup   
   
      # if our flag was set...we need to create the group
      if [[ $gmflag == 1 ]]
      then
         groupadd -r $group
      fi

   fi
   if [[ ${#name} == 0 ]]
   then
      errorFlag=y
      echo "*** Error:Missing fullname for record $recCount ***"
      errorMsg="$errorMsg:missing fullname"
      #echo "Record $recCount:$Record - Missing fullname" >> errorReport
   fi

   if [[ ${#un} == 0 ]]
   then
      errorFlag=y
      echo "*** Error:Missing username for record $recCount ***"
      errorMsg="$errorMsg:missing username"
      #echo "Record $recCount:$Record - Missing username" >> errorReport
   fi

   if [[ ${#password} == 0 ]]
   then
      errorFlag=y
      echo "*** Error:Missing password for record $recCount ***"
      errorMsg="$errorMsg:missing password"
      #echo "Record $recCount:$Record - Missing password" >> errorReport
   fi

   if [[ $errorFlag == y ]]
   then
      echo "Record $recCount in file $fileTo - $Record: - $errorMsg" >> errorReport
   else
   
   # encrypt the password for useradd
   if [[ ${#password} > 0 ]]
   then
      # this beautiful line of code came from 25ft
      # without this...the automation wouldn't work
      # you can thank him later
      newPass=`openssl passwd -1 $password`
   fi

   # -g sets group, -d specifies default login directory, -m forces the making of the
   # directory if it doesn't exist
   useradd -g $group -p $newPass -d /home/$un -c $name -m $un

   # if the above command ran right...
   if [[ $? == 0 ]]
   then
      # tell us
      echo "*** User created successfully ***"

      # begin creating the report
      echo -n "$name:$un:" >> reportFile

      # get the userid and groupid of each user
      userid=`id -u $un`
      groupid=`id -g $un`
      echo -n "$userid:$groupid:" >> reportFile

      # add the date that all this was performed
      cur_date=`date "+%B%e %Y"`
      echo $cur_date >> reportFile
   fi
   fi
done < $fileTo

# delete the temporary file created for each record
rm -f tempRecord
rm -f tempGroup