job control in script

sleep.sh

#!/usr/bin/env bash

set -m

sleep 100 &

echo "sleep in background..."
echo
echo "make sleep going to foreground."
echo "How about try use ^Z to make it background again ?"
echo
fg

echo "sleep done"

sleep2.sh

#!/usr/bin/env bash

# turn on monitor mode
# set -m
set -o monitor

sleep 100 &
jobs

echo "sleep in background..."
echo
echo "make sleep going to foreground."
echo "How about try use ^Z to make it background again ?"
echo

fg
jobs

# turn off monitor mode
set +o monitor

sleep 5
jobs

echo "sleep done"