1	#!/bin/bash
2	#
3	# Job control constructs:
4	# & terminator (instead of ;)
5	# $! -- last PID
6	# wait builtin (wait -n waits for next)
7	#
8	# Only interactive:
9	# fg
10	# bg
11	# %1 -- current job
12
13	### Brace group in background
14	{ sleep 0.01; exit 99; } & wait; echo $?
15	# stdout: 0
16	# status: 0
17
18	### Wait on background process PID
19	{ sleep 0.01; exit 99; } & wait $!; echo $?
20	# stdout: 99
21	# status: 0
22
23	### Builtin in background
24	echo async & wait
25	# stdout: async
26	# status: 0
27
28	### Async for loop
29	for i in 1 2 3; do
30	echo $i
31	sleep 0.0$i
32	done & wait
33	# stdout-json: "1\n2\n3\n"
34	# status: 0