script to enable zram for raspberry pi
Download the script and copy to /usr/bin/ folder
sudo wget -O /usr/bin/zram.sh https://raw.githubusercontent.com/novaspirit/rpi_zram/master/zram.sh
make file executable
sudo chmod +x /usr/bin/zram.sh
edit /etc/rc.local file to run script on boot
sudo nano /etc/rc.local
add line before exit 0
/usr/bin/zram.sh &