Two versions of mysql on one Mac server, need to get data from one to other

Question

My sysadmin patches my Mac server, and suddenly MySQL is pointing at a version 5 install. Prior to this, it was pointing to a version 4 install. My data is stranded in the version 4. Somehow whenever I run the mysql command I end up in the version 5. I need to do a mysqldump of the version 4 stuff to put it in v5. I'm not sure how to:

stop the v5. start the v4. (then mysqldump) stop the v4. start the v5.

Here's how I know about both:

xxx:/usr/bin lynn$ /usr/bin/mysql --version /usr/bin/mysql Ver 14.7 Distrib 4.1.22, for apple-darwin8.0 (powerpc) using EditLine wrapper

xxx:/usr/bin lynn$ /usr/local/mysql --version -bash: /usr/local/mysql: is a directory

xxx:/usr/bin lynn$ /usr/local/mysql/bin/mysql --version /usr/local/mysql/bin/mysql Ver 14.14 Distrib 5.1.32, for apple-darwin9.5.0 (i386) using readline 5.1

xxx:/usr/bin lynn$ echo $PATH /bin:/sbin:/usr/bin:/usr/sbin

Edit: I do have root access, I just don't know the commands. I tried mysqld_start, but I can't get the instance to start.

xxx:/usr/bin rootuser$ mysql

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (61)

xxx:/usr/bin rootuser$ mysqld

su: mysqld: command not found

xxx:/usr/bin rootuser$ mysqld_safe &

[1] 1494

xxx:/usr/bin rootuser$ Starting mysqld daemon with databases from /var/mysql

STOPPING server from pid file /var/mysql/xxx.xxx.xxx.pid

090514 14:27:31 mysqld ended

[1]+ Done mysqld_safe xxx:/usr/bin rootuser$ mysql

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (61)

Answer 1

Moving this to serverfault, voted to close.