How to make shell script run each command asynchronously

Question

I want to do an npm install in a ton of directories.

Can I create a shell script that will run npm install in all of them asynchronously? So I don't have to wait long for all of them to be done?

IE

cd foo; npm install; cd ..; cd bar; npm install; cd ..; etc.

start npm install, basically

Marc B
– Marc B

2015-11-05 18:35:52 +00:00
Commented Nov 5, 2015 at 18:35 — Marc B
– Marc B, Commented Nov 5, 2015 at 18:35

Kenney · Accepted Answer · 2015-11-05 18:37:11Z

2

You can run them in the background using & at the end:

cd foo && npm install &
cd bar && npm install &

There's no need for cd .. here because each line runs in a separate child process. Also I'm using && here instead of ;, otherwise you'd need to add () to group the commands:

( cd foo; npm install ) &
( cd bar; npm install ) &

As a plus, && will not execute commands to it's right if the command to it's left fails.

answered Nov 5, 2015 at 18:37

Kenney

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