Shell Programming and Scripting

Hi all,

I have problem regarding how to change the quantity in the file.

I will explain you by an example.

I have one file whose name is sample. The content of file are as follows:
sample
-----------------------------------------------------------
1 334 3562 2345
5324 85657 75666 845 7456 74 634
8 12 1 4315 1 42 11 452 421 12
42 4 54 21 1 12 43 21 42 42 524 31
225 42 1 1 32 1 1 3 0 9 8 23 2 53 54
-----------------------------------------------------------
I have to change number 5324 from the file whose location is first element in the second line. After changing the number I run one more program after that. I have to change that number by 20 times. I have to change number by 0.1*$i(where 'i' is the looping variable which will vary 0 to 20).

I have written one shell script for that but its not at all changing the value of the variable.

the script is as follows
------------------------------------------------------------------
#!/bin/sh


for (( j = 1 ; j <= 4; j++ )) ### for loop ###
do

sed '2c\ 85657 75666 845 7456 74 634 0.1*$j ' sample > inf

./test inf

wait
done

-------------------------------------------------------------------
here ./test one the executable.

Please help me out.

Thanks in advanced.

Aniket