For how common this task is, it’s incredibly hard to find on Google. You’ll need to remember this for anytime you want to change your user account, password, or just delete your account from your subversion client. This works in Netbeans, RabbitVCS, and a majority of other subversion clients that just connect with the svn package.
grep -r "<HOSTNAME>" ~/.subversion/auth/
(Replace <HOSTNAME> with the SVN’s hostname, so for instance http://example.com/applepie/svn would be example.com) Grep searches inside files for whatever you put in the ” “. The -r makes it recursive, so it will look through all the files in all folders deeper than where it was directed to at the end of the line.
/home/vi/.subversion/auth/svn.simple/888c928072e9643a13b38ea43532896d:<http://example.com:80> My Projects
You want the path before the “:”
rm /home/vi/.subversion/auth/svn.simple/888c928072e9643a13b38ea43532896d
to remove the file, and have subversion forget your account credentials.