midi pitch wheel as pageup/down on xpdf server

gistfile1.sh

#!/bin/bash

# Script to perform next / prev page on note screen when midi-pitch-weel is turned
# Assuming:
#  - notes are displayed on a $server in the only open xpdf session
#  - $user can log into server via ssh without password authentification.
#  - $dump returns when executed the hex-midi dump of the used midi-device
# Dependencies:
# sudo apt-get install xdotool xpdf/epdftool

user=user123
server=123.123.123.123

dump="amidi -p hw:2,0,0 -d"

while true; do
        res=`$dump | grep E1 -m1 | sed -e "s/E1 .. \(..\)/\1/g"`
        if [[ "0x$res" -lt "0x40" ]]; then
                ssh 172.17.9.89 -l$user DISPLAY=:0.0 xdotool search xpdf key Page_Down
                echo "Down"
        else
                ssh 172.17.9.89 -l$user DISPLAY=:0.0 xdotool search xpdf key Page_Up
                echo "Up"
        fi

        # delay... anti double page switch
        # empty dump
        timeout 1s $dump > /dev/null

done;