Renaming files with a lot of spaces

I just want to rename a bunch of files on a Linux-Streaming-Server.

So my first approache was to substitute foo with bar

for file in *; do mv $file `echo $file | sed -r “s/foo/bar/”`; done

But since the bash separator is a space this will not work with files which contains spaces.

So I have to remove or substitute the spaces before. I used translate (tr) to change the spaces to underlines:

for file in *; do mv “$file” `echo $file | tr ‘ ‘ ‘’`; done_

An other approache is to change the bash seperator.