将手册页输出重定向到文件会导致单词中出现双字母

问题描述

我将 man djpeg 的输出重定向到一个文本文件，以便在学习使用它时可以引用它.我的指令是 man djpeg>textfile.txt .但是，输出看起来像这样:

I redirected the output of man djpeg into a text file so that I can reference it as I learn to use it. My instruction was man djpeg > textfile.txt. However, the output looks something like this:

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，但您明白了.为什么要重复某些字符?另外，如果某个函数执行两次或缓存刷新不正确，为什么不重复所有这些操作呢?

There's more but you get the point. Why is it repeating some of the characters? Also, why doesn't it repeat all of them if there's some function executing twice or a cache flushing incorrectly?

推荐答案

'man'程序最初旨在在电传打字机上打印其输出，并使用套印来产生粗体和强调效果.您实际上看到的是文件包含格式为 X ^ HX 的字符串的效果，其中^ H是退格字符.您还可以使用诸如 _ ^ HX 之类的字符串作为下划线(因此_f_i_l_e).

The 'man' program was originally designed to print its output on teletypes, and uses over-printing to produce bold character and underlining effects. What you're actually seeing is the effect of the file containing strings of the form X^HX, where the ^H is a backspace character. You also have strings like _^HX, for underlining (hence the _f_i_l_e).

可以使用文本编辑器(如 vi )轻松剥离这些文本，该文本编辑器将显示退格键.

These can be stripped easily using a text editor like vi, which will display the backspaces.

:%s/_^H//g

将删除下划线，并且

:%s/.^H.//g

黑体字(上面的^ H是ctrl-H.您必须使用 ctrl-V ctrl-H 将其输入到vi中.

the boldings (the ^H in the above is ctrl-H. You will have to use ctrl-V ctrl-H to enter these into vi.

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