通过linux终端将数据发送到另一个进程的stdin [英] Sending data to stdin of another process through linux terminal

问题描述

我一直试图将数据发送到正在运行的进程的stdin.这是我的工作:

I've been trying to send data to stdin of a running process. Here is what I do:

1. 在终端中，我启动了一个c ++程序，该程序仅读取并打印一个字符串.代码摘录:

1. In a terminal I've started a c++ program that simply reads a string and prints it. Code excerpt:

while (true) {
    cin >> s;
    cout << "I've just read " << s << endl;
}

我得到正在运行的程序的PID

I get the PID of the running program

结果: text 出现在运行程序的终端中.请注意，不是我刚刚阅读文本，而是简单的 text .我在做什么错，该怎么做才能打印我刚读过文字" ?

Result: text appears in the terminal where the program is run. Note, not I've just read text, but simply text. What am I doing wrong and what should I do to get this thing to print 'I've just read text'?

推荐答案

在启动C ++程序时，需要确保其输入来自管道而不是来自终端.您可以使用 cat |myapp 来做到这一点.运行后，您可以将应用程序的PID用于 echo text>/proc/PID/fd/0

When you're starting your C++ program you need to make sure its input comes from a pipe but not from a terminal. You may use cat | myapp to do that. Once it's running you may use PID of your application for echo text > /proc/PID/fd/0

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