# whatis 查询一个命令执行什么功能 ## 补充说明 **whatis命令** 是用于查询一个命令执行什么功能，并将查询结果打印到终端上。 whatis命令在用`catman -w`命令创建的数据库中查找command参数指定的命令、系统调用、库函数或特殊文件名。whatis命令显示手册部分的页眉行。然后可以发出man命令以获取附加的信息。whatis命令等同于使用`man -f`命令。 ### 语法 ``` whatis ``` ### 实例 ``` [root@localhost ~]# whatis ls ls (1) - list directory contents ls (1p) - list directory contents [root@localhost ~]# whatis cp cp (1) - copy files and directories cp (1p) - copy files [root@localhost ~]# whatis chown chown (1) - change file owner and group chown (1p) - change the file ownership chown (2) - change ownership of a file chown (3p) - change owner and group of a file [root@localhost ~]# whatis man man (1) - format and display the on-line manual pages man (1p) - display system documentation man (7) - macros to format man pages man (rpm) - A set of documentation tools: man, apropos and whatis. man-pages (rpm) - Man (manual) pages from the Linux Documentation Project. man.config [man] (5) - configuration data for man ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://hezhiqiang.gitbook.io/linux/ming-ling/whatis.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.