How to do a hg update or clone in one line of bash?

Question

I am looking for an option to do an hg update on a repository or to clone it if it doesn\'t exist. So the command has to fail only if something went wrong (clone or update).

Answer 1

cd  && hg update || hg clone 

If the cd fails because directory doesn't exist, then the hg clone is run from the correct directory level.