Suppose i have a file A
1*2*3*4
2*4*4*22

and second file B
2*3*4*5
4*4*6*7

By multiplying file A by file B that is file A by first column in file B respectively
output shud be

2*6*12*20
8*16*24*154


my code is
[CODE][/
for a in A
do
for FILE in B
do
awk 'NR==FNR {
x[FNR] =$1
next
}
{for (f=1;f<=NF;f++)
$f*= x[FNR]
} 1' OFS='*' FS='*' $a $FILE >file_output
done
done
CODE]

then output was
2*3*4*5
8*8*12*14