在 Linux 环境中，如果想要查找一个目录下，所有包含某一个特定字符串的文件，可以使用 find 命令、xargs 命令 和 grep 命令的结合来完成查找。
比如，目录结构如下：
$ tree /refresh/home/aaa
/refresh/home/aaa
├── aaa01.txt
├── aaa02.txt
├── bb
│ ├── bb01.txt
│ └── bb02.txt
└── cc
├── cc01.txt
└── cc02.txt
2 directories, 6 files
$
各个文件的内容如下：
$ cat /refresh/home/aaa/aaa01.txt This is my word aaa001 $ $ cat /refresh/home/aaa/aaa02.txt This is my word aaa02 $ $ cat /refresh/home/aaa/bb/bb01.txt Thi is my word bb01 $ cat /refresh/home/aaa/bb/bb02.txt This is my word bb02 $ cat /refresh/home/aaa/cc/cc01.txt Thi is my word cc01 $ cat /refresh/home/aaa/cc/cc02.txt This is my word cc02
现在，我要查找，在 /refresh/home/aaa 目录及其子目录中，所有 包含 my 这个字符串的所有文件，我可以这样执行：
$ find /refresh/home/aaa | xargs grep "my" /refresh/home/aaa/bb/bb02.txt:This is my word bb02 /refresh/home/aaa/bb/bb01.txt:Thi is my word bb01 /refresh/home/aaa/aaa01.txt:This is my word aaa001 /refresh/home/aaa/cc/cc02.txt:This is my word cc02 /refresh/home/aaa/cc/cc01.txt:Thi is my word cc01 /refresh/home/aaa/aaa02.txt:This is my word aaa02 $