bash 如何附加到管道上？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/331224/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I append onto pipes?
提问by Daniel O
So my question is if I can somehow send data to my program and then send the same data AND its result to another program without having to create a temporary file (in my case ouputdata.txt). Preferably using linux pipes/bash.
所以我的问题是我是否可以以某种方式将数据发送到我的程序，然后将相同的数据及其结果发送到另一个程序，而无需创建临时文件（在我的情况下为 ouputdata.txt）。最好使用 linux 管道/bash。
I currently do the following:
我目前执行以下操作：
cat inputdata.txt | ./MyProg > outputdata.txt
cat inputdata.txt | ./MyProg > outputdata.txt
cat inputdata.txt outputdata.txt | ./MyProg2
cat inputdata.txt outputdata.txt | ./我的程序2
回答by derobert
Here is another way, which can be extended to put the output of two programs together:
这是另一种方法，可以扩展为将两个程序的输出放在一起：
( Prog1; Prog2; Prog3; ... ) | ProgN
That at least works in Bash.
这至少适用于 Bash。
回答by S.Lott
Choice 1 - fix MyProgto write the merged output from the input and it's own output. Then you can do this.
选择 1 - 修复MyProg从输入和它自己的输出写入合并输出。然后你可以这样做。
./MyProg <inputdata.txt | ./MyProg2
Choice 2 - If you can't fix MyProgto write both input and output, you need to merge.
选择 2 - 如果不能MyProg同时写入输入和输出，则需要合并。
./MyProg <inputdata.txt | cat inputdata.txt - | ./MyProg2
