Description of problem: when executing a while statement and assigning
a value to a variable, the value does not exist after the while loop
is completed:

The following is the script

cd /usr/share/terminfo/w
x2=""                                
export x2                            
 ls wy50*|while read x1                
 do                                  
   if [ "X"$x2 = "X" ]               
     then :                          
   else                              
     x2=$x2","                       
   fi                                
   x2=$x2$x1                         
 done                                
echo $x2                             



Version-Release number of selected component (if applicable):

2.05b.0

How reproducible:

See above command segment

Steps to Reproduce:
1.
2.
3.
  
Actual results:

x2=""

Expected results:

wy50,wy50-mc,wy50-vb,wy50-w,wy50-wvb   

Additional info:

for x1 in `ls wy50*`  

instead of 

ls wy50*|while read x1   

does work