1	#!/bin/bash
2
3	#### K and V are variables in (( array[K] = V ))
4	K=5
5	V=42
6	typeset -a array
7	(( array[K] = V ))
8
9	echo array[5]=${array[5]}
10	echo keys = ${!array[@]}
11	echo values = ${array[@]}
12	## STDOUT:
13	array[5]=42
14	keys = 5
15	values = 42
16	## END
17
18	#### when are variables set with 'test -v'
19	test -v unset
20	echo unset=$?
21
22	typeset -a a
23	test -v a
24	echo a=$?
25
26	typeset -A A
27	test -v A
28	echo A=$?
29
30	a[0]=1
31	A['x']=x
32
33	test -v a
34	echo a=$?
35
36	# NOTE: This is a BUG! A is set
37	test -v A
38	echo A=$?
39
40	## STDOUT:
41	unset=1
42	a=1
43	A=1
44	a=0
45	A=0
46	## END
47	## BUG bash STDOUT:
48	unset=1
49	a=1
50	A=1
51	a=0
52	A=1
53	## END
54	## N-I mksh STDOUT:
55	unset=2
56	a=2
57	A=2
58	a=2
59	A=2
60	## END