Linux 命令

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