Shell script for starting multiple processes

background_processes.sh

#!/bin/bash

# first process
cd ~/Desktop/folder1

# start your first process with nohup
# (the `&` is important)
nohup python proc1.py > proc1.out 2>&1 &
echo "proc2.py PID:" $!

# same for the second process
cd ~/Desktop/folder2

nohup python proc2.py > proc2.out 2>&1 &
echo "proc2.py PID:" $!