:g/nbsp/d

That command sets up a “range” of all lines (hence the g for global) that match “nbsp”, and runs the command “d” (delete) on them.

I’m working with a file that was converted by a script from HTML, but had some carryovers that were whole unnecessary lines… No lines with ‘desirable’ content had the nbsp in them, just the junk ones. So we delete them all.

Kudos to this site for the inspiration.