Running multiple programs in parallel from a bash script

This comes in handy when I want to, for example:

• run an MySql proxy to Cloudql or similar, then
• run a project server (fastapi, django etc) that depends on the database connection

From this answer:

set -m  # enable job control

prog1 & prog2 && fg

This will:

• Start prog1.
• Send it to background, but keep printing its output.
• Start prog2, and keep it in foreground, so you can close it with ctrl-c.
• When you close prog2, you'll return to prog1's foreground, so you can also close it with ctrl-c.