Uninstalling MySQL on Solaris I have installed MySQL 5.5.31 in Opensolaris. When I tried starting the MySQL server, it says 
 bash: mysql: command not found
So, I decided to uninstall the whole lot and try doing again.
But I could not find any spporting documents online to do so, because either they refer to .rpm file unistallation pkgrm.
I used .tar extension and pkgrm is not supported in my machine.
Check MySQL service use following  command:

ps -ef | grep mysql


If  MySQL  process is running then first stop mysql process.

kill -9 mysql_pid   


or

/etc/init.d/mysql stop


Remove mysql base and data dir. By default it's location is /usr/local/mysql.
Use  following  command:

rm -r mysql


Start with fresh installation:
Ref this link or this for MySQL  binary installation.