将手册页输出重定向到文件会导致单词出现双字母

Question

我将man djpeg的输出重定向到一个文本文件，以便我可以在学习使用它时引用它。我的指示是man djpeg > textfile.txt。但是，输出看起来像这样：

LS(1)                     BSD General Commands Manual                    LS(1)

NNAAMMEE
     llss -- list directory contents

SSYYNNOOPPSSIISS
     llss [--AABBCCFFGGHHLLOOPPRRSSTTUUWW@@aabbccddeeffgghhiikkllmmnnooppqqrrssttuuwwxx11] [_f_i_l_e _._._.]

DDEESSCCRRIIPPTTIIOONN
     For each operand that names a _f_i_l_e of a type other than directory, llss
     displays its name as well as any requested, associated information.  For
     each operand that names a _f_i_l_e of type directory, llss displays the names
     of files contained within that directory, as well as any requested, asso-
     ciated information.

     If no operands are given, the contents of the current directory are dis-
     played.  If more than one operand is given, non-directory operands are
     displayed first; directory and non-directory operands are sorted sepa-
     rately and in lexicographical order.

     The following options are available:

     --@@      Display extended attribute keys and sizes in long (--ll) output.

     --11      (The numeric digit ``one''.)  Force output to be one entry per
             line.  This is the default when output is not to a terminal.

     --AA      List all entries except for _. and _._..  Always set for the super-
             user.

     --aa      Include directory entries whose names begin with a dot (_.).

     --BB      Force printing of non-printable characters (as defined by
             ctype(3) and current locale settings) in file names as \_x_x_x,
             where _x_x_x is the numeric value of the character in octal.

     --bb      As --BB, but use C escape codes whenever possible.

[...continues]

还有更多，但你明白了。为什么要重复一些角色呢？另外，如果某些功能执行两次或缓存刷新错误，为什么不重复所有这些？

Answer 1

'man'程序最初设计用于在电视类型上打印其输出，并使用过度打印来产生大胆的字符和下划线效果。您实际看到的是包含X^HX形式字符串的文件的效果，其中^ H是退格字符。你也有像_^HX这样的字符串，用于下划线（因此是_f_i_l_e）。

这些可以使用像vi这样的文本编辑器轻松剥离，它将显示退格。

:%s/_^H//g

将删除下划线，和

:%s/.^H.//g

粗体（上面的^ H是ctrl-H。你将不得不使用ctrl-V ctrl-H将这些输入到vi中。

Answer 2

更简洁的方法是首先将输出传递给“col -b”：

man djpeg | col -b > textfile.txt

资料来源：https://unix.stackexchange.com/a/15866