介绍 grep是一个功能强大的文本搜索命令，可以用它来搜索某个文件中是否包含指定的搜索内容，它可以利用正则表达式来做复杂的筛选操作，它还可以为其它命令传输给管道的筛选，比如我们常用到的分析单个进程的操作就是会利用它“ps -ef|grep command”。语法 grep [OPTION]... PATTERN [FILE]... 默认不加参数是显示匹配上的行记录，可以使用--he...

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