Are you using a shell script or vi to do this?

For a shell script you could use sed like this:

echo "Amy Reds , 100 , /bin/sh" | sed 's/ //g'

In vi it is very similar

:%s/ //g

This assumes you want to do this to every line of the file and also assumes you have spaces, not tabs or other whitespace.

If you can give more specifics I am sure you will get a more specific answer.