Comment 4 for bug 914098

I had a feeling the sub-shell wasn't the way to go even as I was writing it, but I had already tried adding a colon to $IFS without success. Unfortunately, 5.4 still doesn't work for me without the small change attached. My tests also show that dash doesn't remove the leading spaces like bash does, so the snippet that parses /proc/net/dev doesn't work stand-alone without `#!/bin/bash` at the top but that doesn't seem necessary for Byobu.