问题描述
我想将(stdout,stderr)从一个进程重定向到另一个进程的(stdin,文件描述符3).我该怎么办?
I want to redirect (stdout,stderr) from one process to (stdin,file descriptor 3) of another. How do I do that?
例如,如果我有myscript.sh
:
#!/bin/sh
# myscript.sh
echo "stdout"
echo "stderr" >&2
和reader.sh
:
#!/bin/sh
# reader.sh
read key
echo "stdin: $key"
read key <&3
echo "fd3: $key"
如何将myscript.sh
的输出传递给reader.sh
,使最终输出为:
How do I pipe the output of myscript.sh
to reader.sh
such that the final output is:
stdin: stdout
fd3: stderr
我最近得到的是:
./myscript.sh 2>&3 | ./reader.sh
但是挂起等待输入(来自fd 3)
But that hangs waiting for input (from fd 3)
推荐答案
我将使用命名管道来完成此操作:
I would do this with a named pipe:
mkfifo err
./myscript.sh 2>err | ./reader.sh 3<err
执行2>& 3只会将stderr发送到父shell指向3的任何位置,如果您尚未在该shell中打开3,它将失败.这对阅读器外壳的3并没有任何好处.即使是继承的,也将是写fd,而不是读fd.
Doing 2>&3 in your attempt just sends stderr to wherever the parent shell has 3 pointed, and will fail if you haven't already opened 3 in that shell. It doesn't do any good for the reader shell's 3; even if inherited, it would be as a write fd, not a read one.
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