bash将stdin重定向到脚本 [英] bash redirecting stdin to script

问题描述

我经历了一些bash I/O教程，但大多数教程都涉及将流重定向到文件或从文件重定向.

I went through some bash i/o tutorials but most of them concern redirecting stream to/from files.

我的问题如下:如何将stdin/stdout/stderr重定向到脚本(或程序).

My problem is the following: how to redirect stdin/stdout/stderr to script (or program).

例如，我有脚本"parentScript.sh".在该脚本中，我要调用黑盒"childScript.sh"，该黑盒需要几个参数-arg1 -arg2 ...并从stdin读取输入.

For instance I have script "parentScript.sh". In that script I want to call blackbox "childScript.sh" which takes few arguments -arg1 -arg2 ... and reads input from stdin.

我的目标是在childScript.sh中使用parentScript.sh内的一些输入进行输入:

My goal is to feed childScript.sh with some input inside parentScript.sh:

...
childScript.sh -arg1 -arg2
????? < "input1"
????? < "input2"
...

另一种情况是我调用了几个程序，我希望它们像这样相互交谈:

Another case would be I call few programs and I want them to talk to each other like this:

...
program1 -arg1 -arg2
program2 -arg1 -arg9
(program1 > program2)
(program2 > program1)
etc...
...

如何解决这两种情况?谢谢

How to solve these 2 cases? Thanks

更具体.我想创建自己的管道(命名或未命名)，并使用它们连接多个程序或脚本，以便它们彼此通信.

To be more specific. I would like to make own pipes (named or not named) and use them to connect multiple programs or scripts so they talk to each other.

例如:program1写入program2和program3并从program2接收.程序2写入程序1和程序3并从程序1接收.程序3仅接收程序1和程序2.

For instance: program1 writes to program2 and program3 and receives from program2. program2 writes to program1 and program3 and receives from program1. program3 only receives form program1 and program2.

推荐答案

管道|是您的朋友:

./script1.sh | ./script2.sh

将从script1.sh发送标准输出到script2.sh.如果您也要发送stderr:

will send stdout from script1.sh to script2.sh. If you want to send stderr as well:

./script1.sh 2>&1 | ./script2.sh

只有stderr:

./script1.sh 2>&1 >/dev/null | ./script2.sh

您还可以在此处制作文档:

You can also make here documents:

./script2.sh << MARKER
this is stdin for script2.sh.
Variable expansions work here $abc
multiply lines works.
MARKER

./script2.sh << 'MARKER'
this is stdin for script2.sh.
Variable expansions does *not* work here
$abc is literal
MARKER

MARKER实际上可以是任何东西:EOF，!，hello，...尽管要注意的一件事是，结束标记前面不能有任何空格/制表符.

MARKER can be practically anything: EOF, !, hello, ... One thing to note though is that there cannot be any spaces / tabs infront of the end marker.

在bash中，您甚至可以使用<<<，它的功能与此处的文档非常相似，如果有人可以澄清的话，将不胜感激:

And in bash you can even use <<< which works much like here documents, if anyone can clarify it would be much appreciated:

./script2.sh <<< "this is stdin for script2.sh"
./script2.sh <<< 'this is stdin for script2.sh'

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