经常使用一条命令，find + -exec参数，但是没有仔细研究过。 今天要写个脚本，又用到这个，故小研究了下了。 如：
find /usr/local/backups -mtime +10 -name "*.*" -exec rm -rf {} /;
先看find 命令的帮助文档：man find
其中的exec选项解释如下：
（1）-exec command ;
Execute command; true if 0 status is returned. All following arguments to find are taken to be arguments to the command argument consisting of ';' is encountered. The string '{}' is replaced by the current file name being processed everywhere it occurs in the arguments to the command, not just in arguments where it is alone, as in some versions of find. Both of these constructions might need to be escaped (with a '/') or quoted to protect them from expansion by the shell. See the EXAMPLES section for examples of the use of the '-exec' option. The specified command is run once for each matched file. The command is executed in the starting directory. There are unavoidable security problems surrounding use of the -exec option; you should use the -execdir option instead.
（2）-exec command {} +
This variant of the -exec option runs the specified command on the selected files, but the command line is built by appending each selected file name at the end; the total number of invocations of the command will be much less than the number of matched files. The command line is built in much the same way that xargs builds its command lines. Only one instance of '{}' is allowed within the command. The command is executed in the starting directory.
（1）; (分号）表示command命令参数的结束，特别强调，对于不同的系统，直接使用分号可能会有不同的意义， 所以使用转义符/在分号前明确说明。
（2）{}表示文件名，也就是find前面处理过程中过滤出来的文件，用于command命令进行处理。
示例：
删除所有临时文件
find / -name "*.tmp" -exec rm -rf {} /;
查找10天前的dmp文件，并将文件copy到/root/davetmp/目录：
find /root/py -mtime +10 -name "*.dmp" -exec cp {} /root/davetmp/ /;
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