Do 

    cd /home/
then

    nano block.sh

copy the code below and paste (right click if you use putty) to the script.


    #!/bin/bash
    while true ; do
        clear
        echo "Press enter to break loop. Script will loop every 3 seconds"
        echo "script by Nixsy 18th august 2013"
        echo "If loop freezes press CTRL+C"
        echo ""
        echo -e "    \033[31mdownloaded\e[0m/\033[32mavailable\e[0m"
        echo -e "    \033[31m"`bitcoin-cli getblockcount 2>&1`"\e[0m"/"\033[32m"`wget -O - https://blockexplorer.com/q/getblockcount 2>/dev/null`"\e[0m"
        read -t 3 -n 3 && break
    done

When you have copied the text to nano hold CTRL+X and then press Y to save.

In terminal type or copy from below followed by the enter key.

    chmod +x block.sh
to start the script type.

    ./block.sh



This is just a little edit of the script from Lohoris, It will clear the screen then loop the script every 3 seconds until a key press.

Credit to Lohoris for the original script.