blocks|key|1134257|text|一种选择是使用named+pipes+(FIFOs)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1134258|mkfifo+a_fifo+b_fifo
./a+>+a_fifo+&
./b+>+b_fifo+&
diff+a_fifo+b_fifo|code-block|syntax|javascript|1134259|..。但是John+Kugelman's+solution干净多了。|1134260|entityMap|0|LINK|mutability|MUTABLE|url|http://linux.die.net/man/3/mkfifo|1|https://stackoverflow.com/a/3800207^0|7|J|0|0|0|5|O|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

One option would be to use <a href="http://linux.die.net/man/3/mkfifo" rel="nofollow noreferrer">named pipes (FIFOs)</a>:

<pre><code>mkfifo a_fifo b_fifo
./a &gt; a_fifo &amp;
./b &gt; b_fifo &amp;
diff a_fifo b_fifo
</code></pre>

... but <a href="https://stackoverflow.com/a/3800207">John Kugelman's solution</a> is much cleaner.

blocks|key|1134453|text|除了这两个答案之外，如果您想要查看并排比较，请使用vimdiff|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1134454|vimdiff+<(./a)+<(./b)|code-block|syntax|javascript|1134455|如下所示：|1134456|​|1134457|📷|atomic|1134458|1134459|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/fcbf6f5fd08916d903d2feff3bf407a4.jpeg|imageAlt^0|P|7|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|15|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|16|8|@]|D|@]|E|$]]|$1|O|3|P|5|Q|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|R|3|N|5|6|7|1B|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z|10|-4]]]]

Adding to both the answers, if you want to see a side by side comparison, use <code>vimdiff</code>:

<pre><code>vimdiff &lt;(./a) &lt;(./b)
</code></pre>

Something like this:

<img src="https://i.stack.imgur.com/TENGw.jpg" alt="enter image description here">

blocks|key|919973|text|在已经很好的答案上再增加一点(对我有帮助！)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|919974|命令docker将其帮助输出到STD_ERR+(即文件描述符2)|offset|length|style|CODE|919975|我想看看docker+attach和docker+attach+--help给出的输出是否相同|919976|$+docker+attach|919977|$+docker+attach+--help|919978|在刚刚输入了这两个命令之后，我执行了以下操作：|919979|$+diff+<(!-2+2>&1)+<(!!+2>&1)|919980|!！与!-1相同，表示在此命令之前运行命令1-最后一个命令|919981|!-2表示在此命令之前运行命令2|919982|2>&1表示将file_descriptor+2输出(STD_ERR)发送到与file_descriptor+1输出(STD_OUT)相同的位置|919983|希望这能起到一些作用。|919984|entityMap^0|0|2|6|F|7|0|4|D|I|K|0|0|F|0|0|M|0|0|0|T|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@$D|13|E|14|F|G]|$D|15|E|16|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|17|8|@$D|18|E|19|F|G]|$D|1A|E|1B|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1C|8|@$D|1D|E|1E|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1F|8|@$D|1G|E|1H|F|G]]|9|@]|A|$]]|$1|N|3|O|5|6|7|1I|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1J|8|@$D|1K|E|1L|F|G]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1M|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1N|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1O|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1P|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|10|$]]

Adding a little more to the already good answers (helped me!):

The command <code>docker</code> outputs its help to <code>STD_ERR</code> (i.e. file descriptor 2)

I wanted to see if <code>docker attach</code> and <code>docker attach --help</code> gave the same output

<code>$ docker attach</code>

<code>$ docker attach --help</code>

Having just typed those two commands, I did the following:

<code>$ diff &lt;(!-2 2&gt;&amp;1) &lt;(!! 2&gt;&amp;1)</code>

!! is the same as !-1 which means run the command 1 before this one - the last command

!-2 means run the command two before this one

2>&amp;1 means send file_descriptor 2 output (STD_ERR) to the same place as file_descriptor 1 output (STD_OUT)

Hope this has been of some use.

Say I have too programs <code>a</code> and <code>b</code> that I can run with <code>./a</code> and <code>./b</code>.

Is it possible to diff their outputs without first writing to temporary files?

Diff output from two programs without temporary files

Docker

假设我有太多的程序a和b，我可以在./a和./b上运行。是否可以在不先写入临时文件的情况下比较它们的输出？

问不带临时文件的两个程序的比较输出
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