scripts can run many processes in parallel

python -m http.server & 
curl localhost:8080

& starts python in the “background”, so it keeps running while curl runs

wait waits for all background processes to finish

command1 &
command2 & 
wait

this waits for both command1 and command2 to finish

concurrency is easy* in bash

in other languages:
smiling stick figure with short curly hair, thinking: threads? how do I do that again?

in bash:

thing1 &
thing2 &
wait

* (if you keep it very simple)

background processes sometimes exit when you close your terminal

you can keep them running with nohup or by using tmux/screen.

$ nohup ./command &

panel 5:

person: jobs, fg, bg, and disown let you juggle many processes in the same terminal, but I almost always just use multiple terminals instead

panel 6:

• jobs: list shell’s background processes
• disown: like nohup, but after process has started
• fg and bg: move process to foreground/background