where is the diff: in these two program
 

here are the two codes

1> code 1
#!/bin/sh

echo -n "enter file name"
read file
c=0
sum=0
avg=0

cat $file |{
while read line; do
c=$(expr $c + 1)
sum=$(expr $sum + $c)
echo $$
#avg=`expr $sum / $c`
done
}
echo $$
echo $?
echo c= $d
echo sum= $sum
echo $avg= `expr $sum / $c`

2> code 2

#!/bin/sh

echo -n "enter file name"
read file
c=0
sum=0
avg=0

while read line; do
c=$(expr $c + 1)
sum=$(expr $sum + $c)
echo $$
#avg=`expr $sum / $c`
done < $file

echo $$
echo $?
echo c= $d
echo sum= $sum
echo $avg= `expr $sum / $c`
--------------------------------------------------------------------


I'm getting solution from second code,...
what i'm thinking is that processes is being forked as we called CAT command
but not fully satisfied
Can ny body help me?

See: http://tldp.org/LDP/abs/html/redircb.html#REDIR2