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du -hs *
删除算例目录下除了m开头的所有文件，注意备份！！注意会把constant文件夹内的也会删除
find . ! -name 'm*' -exec rm -f {} \;
du -h --max-depth=1 这个能一下看很多个
可以在 .bashrc 里 alias 个别名更方便
感谢分享！alias确实更方便！
