How do i use gnu parallel to run commands simultaneously?

giraffelife

To run commands simultaneously you can use GNU parallel.

You can run multiple commands in the background, but parallels works out how many cores you have and runs one job per core.

I have a file with multiple commands, for demonstration purposes the commands in file are the same.

$ cat commands2.txt 
curl -o bootstrap-salt.sh1 -L https://bootstrap.saltstack.com 
curl -o bootstrap-salt.sh2 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh3 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh4 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh5 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh6 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh7 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh8 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh9 -L https://bootstrap.saltstack.com
curl -o bootstrap-salt.sh10 -L https://bootstrap.saltstack.com

Run two commands at the same time.

$ parallel --jobs 2  < commands2.txt

Run all ten commands at the same time

$ parallel --jobs 10 < commands2.txt