Grant on several tables at once

Hello All,

I have a database that contain 72 tables. How can I grant "SELECT" on
all those 72 tables to a user, at once?

I use to do:

# grant select on table1 to marcelo;
# grant select on table2 to marcelo;
# ...
# grant select on table72 to marcelo;

but it is a lot of tables... I would like to do this at once!

Thanks in advance and
Best Regards,

Marcelo