If you ever want to resurrect files that you somehow deleted (like we did last week…) from Subversion – this is how it works:
1. Find the latest revision where the files (here: my_lost_folder) still existed (for example, 409)
2. Do
svn copy http://repository.com/branches/old/lost_folder@409 ./lost_folder
The files are not only brought back to live, but also automatically added to Subversion again.
Good thing I read the SVN book yesterday 
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Oooops… the comment above is spam and I didn’t realize it at once. Only after seeing the website (now deleted) of the author, I became suspicious… and a quick search for “I shall be pleased to become a regular visitor
” yielded over 5000 results.
Hard to imagine I once worked for a spam detection team in a huge & famous company.
Recently stumbled upon another case of lost changes to resurrect: Imagine you changed some files some iterations ago in a branch (e.g. release) and forgot to merge it back to trunk. Imagine further this branch was deleted or recreated from trunk in the meantime. So what to do? First of all find out the revision, in which your changes occured, lets say 12345. Then in the working copy folder do: