Bash:将输出输出到后台进程? [英] Bash: Pipe output into background process?

问题描述

我想将一个进程放入后台，然后将数据通过管道多次传输到该进程.例如:

I would like to put a process into the background, and then pipe data to it multiple times. For example:

cat &                    # The command I want to write into
cat_pid=$!               # Getting the process id of the cat process

echo hello | $cat_pid    # This line won't work, but shows what I want to
                         #   do: write into the stdin of the cat process

所以我有PID，如何写入该进程?我愿意以不同的方式启动cat过程.

So I have the PID, how can I write into that process? I would be open to launching the cat process in a different way.

另外，我在Mac上，所以我不能使用/proc :(

Also, I'm on Mac, so I can't use /proc :(

推荐答案

首先，创建一个管道:

$ mkfifo pipe

第二，使用管道输入启动cat进程:

Second, start your cat process with input from the pipe:

$ cat <pipe &
[1] 4997

现在，将数据发送到管道:

Now, send data to the pipe:

$ echo "this is a test" >pipe
$ this is a test

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