How do I restore one database from a mysqldump containing multiple databases?

You can pipe the dumped SQL through sed and have it extract the database for you. Something like:

cat mysqldumped.sql | \
sed -n -e '/^CREATE DATABASE.*`the_database_you_want`/,/^CREATE DATABASE/ p' | \
sed -e '$d' | \
mysql

The two sed commands:

Only print the lines matching between the CREATE DATABASE lines (including both CREATE DATABASE lines), and
Delete the last CREATE DATABASE line from the output since we don't want mysqld to create a second database.

If your dump does not contain the CREATE DATABASE lines, you can also match against the USE lines.

You can use the mysql command line --one-database option.

mysql> mysql -u root -p --one-database YOURDBNAME < YOURFILE.SQL

Of course be careful when you do this.

You can also use a mysql dumpsplitter.

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