How to rollback to the previous version in svn
In the Subversion, if you want to rollback your current workspace to the previous version, first you can type:
Now, the file status is M, you can commit your modification.
svn cat -r PREV filename > filename
Second, you can :
eg:
svn up -r VERSION_NUMBER
svn up -r 50
Then you can change your workspace to version 50. Note: you cannot commit your modification in this situation.