Hey, I'm running knoppix and I'm trying to run a shell script to change multiple lines of text in multiple files

Code:

#!/bin/sh
for i in 'ls-1 test'
do
sed 's/bob/manny/'g $i > $i.0
mv $i.0 $i
done

Obviously this isn't the original file, but it's on another non-networked machine.

What happens is that the console returns

sed: invalid option -- 1 , gives me options for sed then mv complains about the -1

I tried removing the -1 from ls, instead sed complained about ls.

This seems like it should work, what did I do wrong?