easy full GUI example PROGRAM

#!/bin/bash
# yes/no question
if zenity --question --text="Do You Want To Upgrade Your .drv Document?"; then
     drive list -m 10000000 >> "$(yad --title "Save Updated Drive List Where" --text "Source Directory" --entry)"
  else
    zenity --info --width=560 --title="Begining .. " --timeout 20 --text="<b>Please Wait:</b>"
fi
function menu {

# Input Dialog
input=$(zenity --title=" Grep GUI " --width=560 --text "   Enter Source and Target" --forms --add-entry "Search_Phrase" --add-entry "Target_Document")

ret=$?

# Is clicked exit, then exit.
[[ $ret -eq 1 ]] && exit 0

# Error handling source. If nothing was entered return to menu.
if [ -z "$(echo $input | awk 'BEGIN {FS="|" } { print $1 }')" ]; then
    zenity --width=560 --warning="No Searh Phrase Typed" --text="<b> No Search Specified.</b>\n\n Please Specify Search Phrase. \n\n Back to menu ..."
    menu
fi

# Error handling target. If nothing was entered return to menu
if [ -z "$(echo $input | awk 'BEGIN {FS="|" } { print $2 }')" ]; then
    zenity --width=560 --warning="No target document typed" --text="<b> No target document specified.</b>\n\n Please specify target. EX: /home/$USER/movie.list\n\n Back to menu ..."
    menu
fi

}
menu
Search_Phrase=$(echo $input | awk 'BEGIN {FS="|" } { print $1 }')
Target_Document=$(echo $input | awk 'BEGIN {FS="|" } { print $2 }')

export Search_Phrase
export Target_Document

# Pre warning dialog.
zenity --info --width=560 --height=40 --title="Starting Search.. " --timeout 2 --text="<b> Operation is starting ...  Please wait ..... </b>"


# Start and show a pulsating progressbar.
grep $Search_Phrase $Target_Document > /tmp/grep | kdialog --title "Results!" --textbox /tmp/grep 5000 400
# Success dialog.
zenity --info --width=560 --title="End .. " --timeout 20 --text="<b>Success:</b><span color=\"blue\">  Operation has been successfully finalized.</span> \n\n<b>Searched: $Search_Phrase    ------>    Target Document: $Target_Document</b>"
exit 0
# End here.
echo ""
sudo rm /tmp/grep