extracting game launcher in bash

gistfile1.txt

#!/bin/bash
process_name="$1"

case "$1" in
openarena)
t=/tmp/openarena_extracting
d='/dev/shm/openarena-0.8.8'
e='./openarena.x86_64'
f='/media/utku3/flash_drive/GAMING/openarena/openarena-0.8.8.tar.xz'
;;

xonotic)
t=/tmp/xonotic_extracting
d='/dev/shm/Xonotic'
e='./xonotic-linux64-glx'
f='/media/utku3/flash_drive/GAMING/xonotic/Xonotic.tar.xz'
;;

UrT)
t=/tmp/urbanterror_extracting
d='/dev/shm/UrbanTerror43'
e='./Quake3-UrT.x86_64'
f='/media/utku3/flash_drive/GAMING/urbanterror/UrbanTerror43.tar.xz'
;;

esac


b=($(ls -rt -d -1 /media/utku3/flash_drive/beaetrice/{*,*}))

run () { if pgrep  $process_name ; then beatrice_condemns_you ; fi ; cd $d ; gamemoderun $e ; }
beatrice_condemns_you () { xcowsay --image ${b[$(shuf -i 0-$(("${#b[@]}"-1)) -n1)]} you\'ve double clicked I suppose ; exit ; }
cd /dev/shm
if ls $d
then if ls $t
then echo line 36
beatrice_condemns_you
else echo line 38
run
fi
else echo line 41
mkfifo $t
tar -kxf $f &>$t &
if grep -m 1 'File exists' $t
then echo line 45 
beatrice_condemns_you
else echo line 47
rm $t
run
fi
fi
echo line 52

for some reason launching this through openbox de (via desktop file launching the script file) fifo file doesn't exist!
But kde doesn't have that problem!
I've updated the script to use fifo file