mysql command-line variables

[Foo Bar]

I need a way to pass in a variable from the mysql command. In PostgreSQL I can do something like 'psql -U foo -v DBVAR=bar' and inside the PG shell I can reference the value set for DBVAR. Is something like this possible with the 'mysql' command?

Or is it possible to perhaps use the 'source' command to set the value of a mysql @var from doing something like @var = '\! env | grep bar'.