Advanced bash scripting : essence zenity : Interactive filemerger

#!/bin/sh -u 
zenity --info --ok-label="Start" --width="500" --height="300" --title="Horopter Inc." --text "`basename $0` is loaded. Click start to continue."
current=`pwd`
zenity --question --width="500" --height="300" --title="Welcome to Horopter fileconverter." --text "You need to put all the required files together in a directory, did you do that?"
if [ $? -eq 0 ]
then 
 zenity --info --width="500" --height="300" --title="Horopter Inc." --text "Example: If the files are in a directory called 'apple',\n /folder1/folder2/apple is location into the directory apple."
 path=$(zenity --entry --width="500" --height="300" --title="Directory selection" --text "Enter the location into the directory as absolute path, . for current directory: ")
 if [ -n "$path" ]
 then 
  cd $path
  flname=$(zenity --entry --width="500" --height="300" --title="Directory selection" --text "Enter the name of the output file with extension.")
  echo -e "*******************************   $flname  ******************************\n" > $flname
  echo -e "------------ Compiled by a software from SANTOSH KUMAR DESAI ------------\n" >> $flname
  echo -e "<< This is preformatted text >>" >> $flname
  declare -a var
  var=(*.html *.css *.txt)
  count=0
  for i in "${var[@]}"
  do
   input=`echo $i | cut -d '.' -f1`
   if [ "$input" != "*" ]
   then 
   let count=count+1
   fi
  done
  zenity --info --title="Horopter Inc." --width="500" --height="300" --text "Total $count files were found."
  cnt=1
  ( for i in "${var[@]}"
  do
   input=`echo $i | cut -d '.' -f1`
   if [ "$input" != "*" ]
   then
   echo -e "# copying $i ($cnt of $count)"; sleep 1
   echo -e "--------DOCUMENT $i STARTS HERE--------\n" >> $flname
   cat $i >> $flname
   echo -e "\n--------DOCUMENT $i ENDS HERE-----------\n\n\n" >> $flname
   echo -e "# copying $i complete. ($cnt of $count)" ; sleep 1
   sed '/^$/d' $flname
   echo `expr $cnt \* 100 / $count - 10`; sleep 1
   let cnt=cnt+1
   fi
  done
  echo -e "# Finishing the job"; sleep 1
  echo -e "\n**************************** END OF DOCUMENT ****************************" >> $flname
  echo -e "\nAll files were merged through a shell script from SANTOSH KUMAR DESAI " >> $flname
  echo -e "# Total $count files were copied."; sleep 1
  echo -e "# Compiling all the files into one file is complete.\n"; sleep 1
  echo "100" ; sleep 1
  )| zenity --progress --width="500" --height="300" \
   --title="Merging the files..." \
   --text="Starting progress now..." \
   --percentage=0
  zenity --info --title="Horopter Inc." --width="500" --height="300" --text  "The file is named $flname and it will be available in the same directory as other merged files. \n Thanks for using this shell script ---- Horopter."
 fi
fi 
cd $current
zenity --info --title="Horopter Inc." --ok-label="Finish" --width="500" --height="300" --text "Click finish to exit."
exit 0