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 ```shell whatis ``` ### 实例 ```shell [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 ```