Table of contents

Delete everything except lines containing string

%v/\(keep1\|keep2\)/d
%g!/\(keep1\|keep2\)/d

Replace last occurrence in line

" Replace last space with comma
%s/.*\zs /,/gc

Run command in all Neovim instances

Requires neovim-remote.

# Switch all neovim instances to light theme
$ for f in $(nvr --serverlist); do nvr --servername $f --remote-send ':set bg=light<cr>'; done