shell program help wanted!

["nw x" <xingnw_01 hotmail com>(by way of Cosmio - Internet Gateway <staff intergate ca>)]

Hi, there:
I don't think I am in the correct mailing list for this question, but I do 
need help, so if anyone can answer my question, please help me.
My question is I have lots of files with long name under one directory and 
I want to change the names of the file to temp0, temp1, temp2,...tempN, 
etc. so I wrote the following shell code, but it didn't work (actually, I 
don't know how to make the number at the file name temp?)

thanks in advances!

the code is:
set i=0
for file in `ls`
do
    if [ -f $file ]; then
      cp $file ./temp$i
      if [ $? -ne 0 ]; then
          echo "copy $file failed"
      fi
    fi
    i = 'expr $i+1'
done


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