[Unix] a dos style rename wont work

[Fblade1987]

Hey guys i'm creating a dos style rename script, so if a user types say q14.* as the 1st param and b14.* as the 2nd and will rename all q14 files to b14 but keep the extensions, so i've developed nearly the full script "i think", if i use echo(echo  "if $1 had been renamed it would now be $newfile") to simulate the rename it works fine shows

q14.1 will be renamed to b14.1

q14.2 will be renamed to b14.2

.....etc

but it becomes a whole different story if i alter that line to  "mv $1 $newFile"

#!/bin/sh

case $# in
0)echo Usage: dosRename file >&2
      ;;
*)for file
        do
                case $file in

                [A-Za-z0-9]*.*) type=main
                      ;;
                *.[A-Za-z0-9]* )type=extension
                      ;;
                esac
        #echo $type
        done

        endFile=$file

        while [ $# -ne 1  ]
        do
                case $type in
                'extension')    extension=`echo $endFile |sed -e 's/*././'`
                                newfile=`echo $1 |sed -e "s/.[A-Za-z0-9]*/$extension/"`
                                echo  "if $1 had been renamed it would now be $newfile"
                             #   mv $1 $newfile
                      ;;
                'main')         fileName=`echo $endFile | sed -e 's/.*//'`
                                newFile=`echo $1 | sed -e "s/[A-Za-z0-9]*.(.*[A-Za-z0-9]*)/$fileName.1/"`
                                echo "if $1 had been renamed it would now be $newFile"
                            #    mv $1 $newFile
                      ;;
                esac
                shift 1
        done
      ;;

esac

it renames the 1st one fine then the rest go along the lines of

dosRename q14.* b14.*

it dose first one fine but 2nd one ends up q14.1.2 and third q14.1.2.3

any ideas what is up with my script?

[uber_tom]

you'd expect rn to have that kindof functionality anyway. cant say for certain that it does, cos i've never had to do that but as a rule *nix commands are alot more flexable than equivalent DOS commands.

dont even start on the spelling mistakes