Untitled

#!/bin/sh

string=UDFBLR2\'
string2=214365
a=0
b=0
for i in `seq 1 25`
do
rand=$((RANDOM%6+1))
while [ $rand = $a ] || ([ $rand = $b ] && [ $a = `expr substr $string2 $rand 1` ]); do
  rand=$((RANDOM%6+1))
done
b=$a
a=$rand
var=$var\ `expr substr $string $rand 1`

rand=$((RANDOM%3+1))
if [ $rand -gt 0 ];
then
  rand=$((rand+6))
  var=$var`expr substr $string $rand 1`
fi

done
echo $var