rename命令是Linux下功能非常强的的重命名工具，利用正则表达式使得其使用地非常灵活。
rename命令的格式：
rename [ -v ] [ -n ] [ -f ] perlexpr [ files ]
-v, –verboseVerbose: print names of files successfully renamed.
-n, –no-actNo Action: show what files would have been renamed.
-f, –forceForce: overwrite existing files.
