Checking out older versions of the code

It is sometimes necessary to check out older versions of a piece of code. Assume we wish to check out an old version of detci. If this is the case, the following steps will do this:

1. cd $PSI3/src/bin/detci
2. svn co -revision {2002-02-17}

This will check the main repository and provide you with the code as it stood exactly on February 17th, 2002.