如果任何命令失败，与退出失败并行运行命令 [英] run commands in parallel with exit fail if any command fails

问题描述

需要 bash 脚本方面的帮助.目标是:- 并行运行多个命令- 如果任何命令返回非零退出状态，则退出 1

Need help in a bash script. The goal is: - Run several commands in parallel - Exit 1 if any command return not-zero exit status

即

使用中间命令运行有错误:

Run with middle command has error:

$ ./parallel_commands "echo 1" "_echo 2" "echo 3" && echo "OK"
1
3
./parallel_commands: line 4: _echo: command not found
OK <- Incorrect

运行所有命令都有错误:

Run with all commands have errors:

$ ./parallel_commands "_echo 1" "_echo 2" "_echo 3" && echo "OK"
./parallel_commands: line 4: _echo: command not found
./parallel_commands: line 4: _echo: command not found
./parallel_commands: line 4: _echo: command not found
-> Result is fail -> Correct

Bash 脚本:

#!/bin/bash

for cmd in "$@"; do {
  $cmd & pid=$!
  PID_LIST+=" $pid";
} done

trap "kill $PID_LIST" SIGINT

wait $PID_LIST

谢谢.

推荐答案

您可能正在使用 GNU Parallel 寻找类似的东西:

You are probably looking for something like this using GNU Parallel:

parallel ::: "echo 1" "_echo 2" "echo 3" && echo OK

GNU Parallel 是一个通用的并行器，可以轻松地在同一台机器或您可以通过 ssh 访问的多台机器上并行运行作业.

GNU Parallel is a general parallelizer and makes is easy to run jobs in parallel on the same machine or on multiple machines you have ssh access to.

如果您想在 4 个 CPU 上运行 32 个不同的作业，一个直接的并行化方法是在每个 CPU 上运行 8 个作业:

If you have 32 different jobs you want to run on 4 CPUs, a straight forward way to parallelize is to run 8 jobs on each CPU:

GNU Parallel 会在完成后生成一个新进程 - 保持 CPU 处于活动状态，从而节省时间:

GNU Parallel instead spawns a new process when one finishes - keeping the CPUs active and thus saving time:

安装

如果没有为您的发行版打包 GNU Parallel，您可以进行个人安装，这不需要 root 访问权限.这样做可以在 10 秒内完成:

If GNU Parallel is not packaged for your distribution, you can do a personal installation, which does not require root access. It can be done in 10 seconds by doing this:

(wget -O - pi.dk/3 || curl pi.dk/3/ || fetch -o - http://pi.dk/3) | bash

其他安装选项见http://git.savannah.gnu.org/cgit/parallel.git/tree/README

了解详情

查看更多示例:http://www.gnu.org/software/parallel/man.html

观看介绍视频:https://www.youtube.com/playlist?list=PL284C9FF2488BC6D1

浏览教程:http://www.gnu.org/software/parallel/parallel_tutorial.html

注册电子邮件列表以获得支持:https://lists.gnu.org/邮递员/列表信息/并行

Sign up for the email list to get support: https://lists.gnu.org/mailman/listinfo/parallel

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