Adiconar "redimensionar imagem" a script.

Boa Tarde.

Atualmente estou usando o Linux Mint 13, e vi que não existe a opção "enviar para" ou está desabilitada e não achei onde habilitar.
Então encontrei um script onde adiciona direto a opção "enviar para thunderbird" e nele abre uma janela perguntando se quer compactar, achei bem legal isso.
Mas o que sinto falta e que o thunderbird do windows faz é redimensionar a foto, quando selecionado com botão direito em cima de uma ou várias fotos, ele dá a opção de redimensionar, assim fazendo uma foto de 3mb por ex: cair para 500kb.
Gostaria de acrescentar isso a esse script, que além de pedir na primeira janela para compactar, que abra uma segunda janela perguntando se quer redimensionar.

O script é esse:

#!/bin/bash

#

#   NAME: Send files using Thunderbird

# AUTHOR: Ronan Arraes Jardim Chagas <ronisbr@gmail.com>

#   DATE: 19 Apr 2012

#

# Copyright (C) 2012 Ronan Arraes Jardim Chagas <ronisbr@gmail.com>

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#



###

# Variables

##



DIALOG="matedialog"

EMAIL_CLIENT="thunderbird"

ZIP="zip"

RAR="rar a"

TARGZ="tar -czf"

TARBZ2="tar -cjf"



###

# Script

###



# If no file was selected, then just exit

[ "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" == "" ] && exit 1;



# Ask how the user wants to send the file

answer=$($DIALOG --title "Send file using Thunderbird " --text "Do you want to compress the files?" --list --radiolist --column "Choice" --column "Format" true "Do not compress" false ".zip" false ".rar" false ".tar.gz" false ".tar.bz2&quot

[ $? -ne 0 ] &&    exit 1



if [ "$answer" == "Do not compress" ];

then

    # The user does not want to compress the files

    command_option="-compose attachment='$(echo "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" | awk 'BEGIN { FS = "\n" } { printf "%s,", $1 }' | sed -e s#,,## )'"

    $EMAIL_CLIENT $command_option

else

    # Ask how the user wants to name the compressed file

    filename_out=$($DIALOG --entry --text "Enter the compressed file name (extension will be added):" --entry-text "attachment&quot

    [ $? -ne 0 ] && exit 1



    filename_in=$(echo "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" | awk 'BEGIN { FS = "\n" } { printf "%s ", $1 }')



    case $answer in

        # The user wants .zip

        ".zip&quot

            if [ -e /tmp/$filename_out.zip ];

            then

                rm /tmp/$filename_out.zip

            fi



            # Compress the file

            $ZIP /tmp/$filename_out.zip "$@"

            command_option="-compose attachment='/tmp/$filename_out.zip'"

        ;;



        # The user wants .rar

        ".rar&quot

            if [ -e /tmp/$filename_out.rar ];

            then

                rm /tmp/$filename_out.rar

            fi



            # Compress the file

            $RAR /tmp/$filename_out.rar "$@"

            command_option="-compose attachment='/tmp/$filename_out.rar'"

        ;;



        # The user wants .tar.gz

        ".tar.gz&quot

            if [ -e /tmp/$filename_out.tar.gz ];

            then

                rm /tmp/$filename_out.tar.gz

            fi



            # Compress the file

            $TARGZ /tmp/$filename_out.tar.gz "$@"

            command_option="-compose attachment='/tmp/$filename_out.tar.gz'"

        ;;



        # The user wants .tar.bz2

        ".tar.bz2&quot

            if [ -e /tmp/$filename_out.tar.bz2 ];

            then

                rm /tmp/$filename_out.tar.bz2

            fi



            # Compress the file

            $TARBZ2 /tmp/$filename_out.tar.bz2 "$@"

            command_option="-compose attachment='/tmp/$filename_out.tar.bz2'"

        ;;

    esac



    $EMAIL_CLIENT $command_option

fi

Abraço.