Gnome 3.16 make top bar transparent

#!/bin/bash

# Modify gnome-shell
# should NOT use 'PWD'
_PWD_=/tmp/virt-shares/gnome-shell
_GST_=/usr/share/gnome-shell/gnome-shell-theme.gresource
THEME=theme

rm    -rf $_PWD_
mkdir -p  $_PWD_
cd        $_PWD_

# 1) Extract gnome-shell-theme.gresource into $_PWD_/$THEME
mkdir $THEME

for path in $(gresource list $_GST_); do
    file=$(echo $path | sed -e 's/^\/org\/gnome\/shell\/theme\///g')    
    gresource extract $_GST_ $path > $_PWD_/$THEME/$file
done

# 2) Create gnome-shell-theme.gresource.xml inside $_PWD_/$THEME
XML_FILE=$_PWD_/$THEME/gnome-shell-theme.gresource.xml

echo "<?xml version="1.0" encoding="UTF-8"?>"          >> $XML_FILE
echo "<gresources>"                                    >> $XML_FILE
echo "  <gresource prefix=\"/org/gnome/shell/theme\">" >> $XML_FILE

for path in $(gresource list $_GST_); do
    file=$(echo $path | sed -e 's/^\/org\/gnome\/shell\/theme\///g')    
    echo "    <file>$file</file>"                      >> $XML_FILE    
done

echo "  </gresource>"                                   >> $XML_FILE
echo "</gresources>"                                   >> $XML_FILE

# 3) do some configution (e.g. modify gnome-shell.css, 
# you can comment this and do your own modified css)
sed -i "549,550s/black/transparent/" $_PWD_/$THEME/gnome-shell.css

# 4) build
cd $_PWD_/$THEME
glib-compile-resources $(basename $XML_FILE)
cp gnome-shell-theme.gresource $_GST_