wp db export
Will output something like Succes: Exported to 'dbname-2018-09-16-2790c11.sql'
Often you need the filename.
--porcelain
flag to the rescue!
wp db export --porcelain
dbname-2018-09-16-2790c11.sql
This will work on a lot of commands that have one item output.
Stuff like wp post create ....
Here is a complete list of commands that have the –porcelain flag
Commands that output more items usually have a --format
flag to handle output.