从命名管道捕获非零退出代码 [英] Capture non-zero exit code from named pipe

问题描述

即使发送到命名管道的过程失败，以下玩具脚本(tmp.sh)也会以代码0退出.如何从命名管道中捕获非零退出代码?或更普遍地说，某事出了错?

The following toy script (tmp.sh) exits with code 0 even if the process sent to the named pipe fails. How can I capture the non-zero exit code from the named pipe? Or more in general, the fact that something has gone wrong?

#!/bin/bash

set -eo pipefail

mkfifo mypipe
FOOBAR > mypipe &

cat mypipe

---

运行并检查退出代码:

---

Run and check exit code:

bash tmp.sh
tmp.sh: line 6: FOOBAR: command not found

echo $? # <- Exit code is 0 despite the "command not found"!

推荐答案

您需要捕获后台进程的进程ID，并wait为其设置正确的退出状态:

You need to capture process id of background process and wait for it to set the correct exit status:

#!/bin/bash
set -eo pipefail

rm -f mypipe
mkfifo mypipe

FOOBAR > mypipe &
# store process id of above process into pid
pid=$!

cat mypipe

# wait for background process to complete
wait $pid

现在，当您运行它时:

bash tmp.sh
tmp.sh: line 6: FOOBAR: command not found
echo $?
127

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