$ svn up
-bash: svn: command not found
“Subversion-1.6.17-1_10.7.x.pkg” can’t be opened because it is from an unidentified developer.
Your security preferences allow installation of only apps from the Mac App Store and identified developers.
Searched App Store for svn.. nothing.
Log in with Apple Developer account here.
Download "Command Line Tools (OS X Mountain Lion)"
After installing the xcode452cltools10_86938211a.dmg package:
$ which svn
$ svn --version
svn, version 1.6.16 (r1073529)
compiled Jul 20 2011, 13:37:48
It is still OLD svn, but it will do. :)