file rename using bash shell

I'm in need of a bash shell script to
remove the extension *.bak from all files that contain the extension *.bak.
the file names are unknown.
the following commands strip the extension from the filename:
 filename=/test/file.bak
 outfile=${filename%.bak}
 cp filename outfile
will change one file, I need a way of changing multiple files that have unknow filenames. Probably need to use ls somehow.  does anyone know the shell commands to do this?
deskAsked:
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ozoCommented:
for filename in /test/*.bak ; do
  cp $filename ${filename%.bak}
done
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deskAuthor Commented:
Thank You
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