重定向应用程序（JAVA）的输入，但仍允许在标准输入BASH [英] Redirecting input of application (java) but still allowing stdin in BASH

问题描述

我有点困惑，我有这个工作的昨天，但它只是停止接受重定向的标准输入，几乎是神奇。

I'm a little confused, I had this working yesterday, but it just stopped accepting the redirected stdin, almost magically.

set -m
mkfifo inputfifo
mkfifo inputfifo_helper
((while true; do cat inputfifo; done) > inputfifo_helper)&
trap "rm -f inputfifo inputfifo_helper java.pid; kill $!" EXIT

exec 3<&0
(cat <&3 > inputfifo)&

NOW=$(date +"%b-%d-%y-%T")

if ! [ -d "logs" ]; then
    mkdir logs
fi

if [ -f "server.log" ]; then
    mv server.log logs/server-$NOW.log
fi
java <inputfifo_helper -jar $SERVER_FILE & echo $! > java.pid && fg

这是运行良好，我可以附和事情inputfifo和应用得到了它，并把它的控制台，以及我可以直接键入。它甚至可以通过屏幕上的工作。绝对没有code-明智的改变，但重定向标准输入已停止工作。我试图改变的文件描述符9，甚至是127，但是没有固定它。

This was running fine, I could echo things to inputfifo and the app got it, and I could type directly into it's console as well. It even worked through screen. Absolutely nothing code-wise has changed, but the redirected stdin has stopped working. I tried changing the file descriptor to 9, or even 127, but neither fixed it.

我是不是忘了什么东西？有没有它打破了一个具体的理由，不再工作？

Am I forgetting something? Is there a specific reason it broke and no longer works?

（我使用的，而不是发送输入到屏幕本身，因为我开始屏幕分离，并拒绝，除非它被连接到ATLEAST一旦接收输入这个，我不知道这是否是一个错误或预期）

(I'm using this instead of sending input to the screen itself because I start the screen detached and it refuses to receive input unless it's been attached to atleast once, I don't know if this is a bug or intended)

推荐答案

如果你能保持你的java程序后台运行，您可以尝试从控制终端的/ dev / tty的，写使用而读循环inputfifo。

If you can keep your java program backgrounded, you may try to read from the controlling terminal /dev/tty and write to inputfifo using a while-read loop.

# ...
java <inputfifo_helper -jar $SERVER_FILE & echo $! > java.pid

while IFS="" read -e -r -d $'\n' -p 'input> ' line; do
  printf '%s\n' "${line}"
done </dev/tty >inputfifo

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