| 1 | whatis
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| 2 | ===
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| 3 |
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| 4 | 查询一个命令执行什么功能
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| 5 |
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| 6 | ## 补充说明
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| 7 |
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| 8 | **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。
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| 9 |
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| 10 | 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。
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| 11 |
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| 12 | ### 语法
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| 13 |
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| 14 | ```shell
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| 15 | whatis
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| 16 | ```
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| 17 |
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| 18 | ### 实例
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| 19 |
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| 20 | ```shell
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| 21 | [root@localhost ~]# whatis ls
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| 22 | ls (1) - list directory contents
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| 23 | ls (1p) - list directory contents
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| 24 |
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| 25 | [root@localhost ~]# whatis cp
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| 26 | cp (1) - copy files and directories
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| 27 | cp (1p) - copy files
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| 28 |
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| 29 | [root@localhost ~]# whatis chown
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| 30 | chown (1) - change file owner and group
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| 31 | chown (1p) - change the file ownership
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| 32 | chown (2) - change ownership of a file
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| 33 | chown (3p) - change owner and group of a file
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| 34 |
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| 35 | [root@localhost ~]# whatis man
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| 36 | man (1) - format and display the on-line manual pages
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| 37 | man (1p) - display system documentation
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| 38 | man (7) - macros to format man pages
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| 39 | man (rpm) - A set of documentation tools: man, apropos and whatis.
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| 40 | man-pages (rpm) - Man (manual) pages from the Linux Documentation Project.
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| 41 | man.config [man] (5) - configuration data for man
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| 42 | ```
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| 43 |
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| 44 |
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