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+# 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
+
+