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。
语法格式: whatis [参数]
常用参数:
参考实例
ls命令执行情况:
[root@linuxcool ~]# whatis ls
ls (1) - list directory contents
ls (1p) - list directory contents
cp命令执行情况:
[root@linuxcool ~]# whatis cp
cp (1) - copy files and directories
cp (1p) - copy files
chown命令执行情况:
[root@linuxcool ~]# 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
man命令执行情况:
[root@linuxcool ~]# 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