how to save history for file in svn using mv?

trunk1/

svn log show many revisions for each file.

after

svn mv trunk1/ trunk2/

svn log show 1 revision ( create trunk2 ), but I want see ALL revisions for each file in trunk1

You need to do a svn copy followed by a svn delete (if you want to completely remove trunk1). This will retain all the history from trunk1 in the new trunk2. Only svn copy will keep the history of the original location.

The reason this happens is because of some internal workings of svn move from the very early days of development of Subversion. This is something the Subversion development community wants to fix, but it's going to take a lot of work to correct. This is penciled in for a 2.0 release which could a long time away.