Run script or command multiple times

Run multiple detached/concurrent scripts or commands For zsh shell:

repeat 10 { echo "TEST" && sleep 3 & }

For other terminals:

for run in {1..10}; do echo "TEST" && sleep 3 &; done

Run multiple scripts or commands in single thread

repeat 10 { echo "TEST" && sleep 3 }

For other terminals:

for run in {1..10}; do echo "TEST" && sleep 3 ; done

NOTE: the "sleep" is used just to showcase the thread or concurrency.