# SVN 显示两个版本之间修改过的文件名
    svn diff --summarize -r 2119:head
    svn diff --summarize -r 2119:2120
    
# SVN 获取最新head 的commit id  
    svn info --show-item  revision    
    
# Git 显示两个版本之间修改过的文件名
    git diff 456bcb head --name-only   
    git diff 456bcb 93593a --name-only 

# Git 获取最新head 的commit id   
    git rev-parse HEAD