如何制作一个同时创建 40 个程序实例的 bash 脚本？
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How to make a bash script that creates 40 simultaneous instances of a program?
提问by chris
I am new to bashand Linux.
I have a program I have written that I want to create multiple simultaneous instances of.
我是bash和 的新手Linux。我有一个我写的程序，我想同时创建多个实例。
Right now, I do this by opening up 10 new terminals, and then running the program 10 times (the command I run is php /home/calculatedata.php
现在，我通过打开 10 个新终端，然后运行该程序 10 次（我运行的命令是 php /home/calculatedata.php
What is the simplest way to do this using a bash script? Also, I need to know how to kill the instances because they are running an infinite loop.
使用 bash 脚本执行此操作的最简单方法是什么？另外，我需要知道如何杀死实例，因为它们正在运行无限循环。
Thanks!!
谢谢！！
采纳答案by sth
You can use a loop and start the processes in the background with &:
您可以使用循环并在后台启动进程&：
for (( i=0; i<40; i++ )); do
php /home/calculatedata.php &
done
If these processes are the only instances of PHP you have running and you want to kill them all, the easiest way is killall:
如果这些进程是您运行的唯一 PHP 实例并且您想将它们全部杀死，最简单的方法是killall：
killall php
回答by ghostdog74
for instance in {1..40}
do
php myscript &
done
回答by codaddict
How about running the php process in the background:
在后台运行php进程怎么样：
#!/bin/bash
for ((i=1;i<=40;i+=1)); do
php /home/calculatedata.php &
done
You can terminate all the instances of these background running PHP process by issuing:
您可以通过发出以下命令来终止这些后台运行 PHP 进程的所有实例：
killall php
Make sure you don't have any other php processes running, as they too will be killed. If you have many other PHP processes, then you do something like:
确保您没有任何其他 php 进程正在运行，因为它们也会被杀死。如果您有许多其他 PHP 进程，那么您可以执行以下操作：
ps -ef | grep /home/calculatedata.php | cut_the_pid | kill -9
回答by Tjunier
if you have the seq(1)program (there are chances that you have it), you can do it in a slightly more readable way, like this:
如果你有这个seq(1)程序（有可能你有它），你可以用一种更易读的方式来做，像这样：
for n in $(seq 40); do
mycmd &
done
In this case the nvariable isn't used.
Hope this helps.
在这种情况下，n不使用变量。希望这可以帮助。
回答by nobody
You can start the instances with a simple loop and a terminating "&" to run each job in the background:
您可以使用一个简单的循环和一个终止的“&”来启动实例以在后台运行每个作业：
INSTANCES=40
for ((i=0; $i<$INSTANCES; ++i))
do
mycmd &
done
回答by Christopher Hicks
This script is a loop that creates instances of the 'while true; do :' loop. It continues making jobs until it's cancelled, and all of the jobs run in the background. You can add variables for index counter and change : to your code.
这个脚本是一个循环，它创建 'while true; 的实例；做：'循环。它会继续创建作业直到它被取消，并且所有作业都在后台运行。您可以为索引计数器添加变量并更改 : 到您的代码。
while true; do while true; do :; done & done
while true; do while true; do :; done & done
to stop:
停止：
killall bash
killall bash
