1	#!/bin/bash
2	#
3	# Var refs are done with ${!a} and local/declare -n.
4	#
5	# http://stackoverflow.com/questions/16461656/bash-how-to-pass-array-as-an-argument-to-a-function
6
7	### pass array by reference
8	show_value() {
9	local -n array=$1
10	local idx=$2
11	echo "${array[$idx]}"
12	}
13	shadock=(ga bu zo meu)
14	show_value shadock 2
15	# stdout: zo
16
17
18	### pass assoc array by reference
19	show_value() {
20	local -n array=$1
21	local idx=$2
22	echo "${array[$idx]}"
23	}
24	days=([monday]=eggs [tuesday]=bread [sunday]=jam)
25	show_value days sunday
26	# stdout: jam
27
28	### pass local array by reference, relying on DYNAMIC SCOPING
29	show_value() {
30	local -n array=$1
31	local idx=$2
32	echo "${array[$idx]}"
33	}
34	caller() {
35	local shadock=(ga bu zo meu)
36	show_value shadock 2
37	}
38	caller
39	# stdout: zo
40	# mksh appears not to hav elocal arrays!
41	# BUG mksh stdout-json: ""
42	# BUG mksh status: 1
43
44	### Var ref with ${!a}
45	a=b
46	b=c
47	echo ref ${!a}
48	# Woah mksh has a completely different behavior -- var name, not var ref.
49	# stdout: ref c
50	# BUG mksh stdout: ref a
51	# N-I dash/zsh stdout-json: ""
52
53	### Bad var ref with ${!a}
54	#set -o nounset
55	a='bad var name'
56	echo ref ${!a}
57	# Woah even dash implements this!
58	# stdout-json: "ref\n"
59	# BUG mksh stdout: ref a
60	# N-I dash/zsh stdout-json: ""
61
62	### Nested ${}
63	bar=ZZ
64	echo ${foo:-${bar}}
65	# stdout: ZZ