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	### pass assoc array by reference
18	show_value() {
19	local -n array=$1
20	local idx=$2
21	echo "${array[$idx]}"
22	}
23	days=([monday]=eggs [tuesday]=bread [sunday]=jam)
24	show_value days sunday
25	# stdout: jam
26	# BUG mksh stdout: [monday]=eggs
27	# mksh note: it coerces "days" to 0? Horrible.
28
29	### pass local array by reference, relying on DYNAMIC SCOPING
30	show_value() {
31	local -n array=$1
32	local idx=$2
33	echo "${array[$idx]}"
34	}
35	caller() {
36	local shadock=(ga bu zo meu)
37	show_value shadock 2
38	}
39	caller
40	# stdout: zo
41	# mksh appears not to hav elocal arrays!
42	# BUG mksh stdout-json: ""
43	# BUG mksh status: 1
44
45	### Var ref with ${!a}
46	a=b
47	b=c
48	echo ref ${!a}
49	# Woah mksh has a completely different behavior -- var name, not var ref.
50	# stdout: ref c
51	# BUG mksh stdout: ref a
52	# N-I dash/zsh stdout-json: ""
53
54	### Bad var ref with ${!a}
55	#set -o nounset
56	a='bad var name'
57	echo ref ${!a}
58	# Woah even dash implements this!
59	# stdout-json: "ref\n"
60	# BUG mksh stdout: ref a
61	# N-I dash/zsh stdout-json: ""
62
63	### Nested ${}
64	bar=ZZ
65	echo ${foo:-${bar}}
66	# stdout: ZZ