mkdir -p $BASE_DIR/work
svn co -q $REPOS_URL/branches/dev/Share/modify_files_base $BASE_DIR/work/b1
svn co -q $REPOS_URL/branches/dev/Share/modify_files_merge1 $BASE_DIR/work/b2
svn co -q $REPOS_URL/branches/dev/Share/modify_files_merge2 $BASE_DIR/work/b3