linux 命令和教程补充

Linux/command/whatis.md

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+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
+```
+
+