Shell Programming and Scripting

Ok, so this question is probably much easier than I'm making it, and thus why I've spent almost 2 hours now on this . I'm trying to use a command that reads out specific data from a file and and saves it to another file. The code is only a few lines, and here it is below:

Code:

#!/bin/csh
 
set x=1
 
while ($x <=500)
   hdp dumpsds -n variable -d -o newfile[$x].txt -x [$x]oldfile
   @ x++
end

Basically put, this is meant to, from each of the 500 oldfiles(1oldfile, 2oldfile, 3oldfile, etc.), extract variable's data and save them to newfile1.txt, newfile2.txt, etc). But I just get one file created, called -x, which is just the variable data from the last oldfile. Thanks for your help in advance.

Is the use of csh a requirement ?
http://www.grymoire.com/Unix/CshTop10.txt

hey ctsgnb,
No, csh is not the required format; it can be just a regular sh script. I think I just used csh is because that's what I was taught in for shell type scripting.

Code:

#!/bin/ksh
x=1
while [ $x -le 500 ]
do
hdp dumpsds -n variable -d -o newfile${x}.txt -x ${x}oldfile
let x+=1
done

Thanks ctsgnb, that solved the problem.