选项

说明

--version

显示命令版本信息

--help

显示帮助文档

-b

过滤所有的控制字符

-f

过滤掉RLF字符，忽略HRLF字符

-p

忽略未知的控制字符

-x

将多个空格用tab代替

-lnum

设置缓冲区大小，默认128行

[root@192 weijie]# man clear > 3.c                  //将手册从定向到文件

[root@192 weijie]# vim 3.c                            //编辑文件，内部有很多乱码，这些都是控制字符

clear(1)                                                             clear(1)

N^HNA^HAM^HME^HE

       c^Hcl^Hle^Hea^Har^Hr - clear the terminal screen

S^HSY^HYN^HNO^HOP^HPS^HSI^HIS^HS

       c^Hcl^Hle^Hea^Har^Hr

D^HDE^HES^HSC^HCR^HRI^HIP^HPT^HTI^HIO^HON^HN

       c^Hcl^Hle^Hea^Har^Hr clears your screen if this is possible.  It looks in the environ-

       ment for the terminal type and then in the t^Hte^Her^Hrm^Hmi^Hin^Hnf^Hfo^Ho database to  figure

out how to clear the screen.

[root@192 weijie]# man clear | col -b > 3.c                //将手册内容过滤之后，定向到文件

[root@192 weijie]# vim 3.c                                    //编辑文件内容，没有乱码

clear(1)                                                             clear(1)

NAME

clear - clear the terminal screen

SYNOPSIS

clear

DESCRIPTION

       clear clears your screen if this is possible.  It looks in the environ-

       ment for the terminal type and then in the terminfo database to  figure

       out how to clear the screen.