我重定向了输出man djpeg到一个文本文件中，以便我在学习使用它时可以参考它。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。为什么有些角色会重复？另外，如果某个函数执行两次或缓存刷新不正确，为什么它不重复所有这些？
一种更简洁的方法是首先将输出通过管道传输到“col -b”：
man djpeg | col -b > textfile.txt
Source: https://unix.stackexchange.com/a/15866
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