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Use a for loop to go through the filenames in the directory. In this version, only loop through the filenames that do not have a ".old" extension

Inside the loop, rename the file to the new name.

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4  
That reads an awful lot like a homework assignment. – garyjohn Nov 22 '11 at 1:48

As this isn't a homework question, and you just want to know the best way to do this, here is a way to do it with find:

find /startfolder -not -name '*.old' -exec mv {} newname_{} \;

This will get all files that don't have the suffix 'old' and rename them with the prefix newname_

No for loop required.

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Assuming access to bash 4+ (check with bash --version) this can be done with a two-liner:

shopt -s extglob
for f in !(*.old); do mv -- "$f" new_"$f"; done
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You need to replace what's between do and done this is an example of how you can use $f

#!/bin/sh

cd /data
list=`ls -rt`

for f in $list
do
    c=`grep -c or=90 $f`
    if [ "$c" -gt "0" ]; then    
        echo "file is $f and it has $c"
    fi
done

cd -
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This will break for any filenames with spaces, since for splits on spaces by default; and for filenames containing newlines, since ls splits on newlines. – evilsoup May 28 '13 at 0:45

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