This might be useful to avoid non-zero returncodes when there are no search
results and xargs' command expect one or more arguments, like in `rm`.
It can also be used to purge mail files from disk:
- $ notmuch search --format=text0 --output=files tag:deleted | xargs -0 rm
+ $ notmuch search --format=text0 --output=files tag:deleted | xargs -0 --no-run-if-empty rm
Make sure you run "notmuch new" after the last command so the database
becomes aware that the files have been removed and can remove the