1	#!/bin/bash
2
3	### no expansion
4	echo {foo}
5	# stdout: {foo}
6
7	### expansion
8	echo {foo,bar}
9	# stdout: foo bar
10
11	### double expansion
12	echo {a,b}_{c,d}
13	# stdout: a_c a_d b_c b_d
14
15	### { in expansion
16	# bash and mksh treat this differently. bash treats the
17	# first { is a prefix. I think it's harder to read, and \{{a,b} should be
18	# required.
19	echo {{a,b}
20	# stdout: {{a,b}
21	# BUG bash stdout: {a {b
22
23	### quoted { in expansion
24	echo \{{a,b}
25	# stdout: {a {b
26
27	### } in expansion
28	# hm they treat this the SAME. Leftmost { is matched by first }, and then
29	# there is another } as the postfix.
30	echo {a,b}}
31	# stdout: a} b}
32
33	### Empty expansion
34	echo a{X,,Y}b
35	# stdout: aXb ab aYb
36
37	### nested brace expansion
38	echo X{A,x{a,b}y,B}Y
39	# stdout: XAY XxayY XxbyY XBY
40
41	### expansion on RHS of assignment
42	# I think bash's behavior is more consistent. No splitting either.
43	v={X,Y}
44	echo $v
45	# stdout: {X,Y}
46	# BUG mksh stdout: X Y
47
48	### no expansion with RHS assignment
49	{v,x}=X
50	# status: 127
51
52	### Tilde expansion
53	HOME=/home/foo
54	echo ~
55	HOME=/home/bar
56	echo ~
57	# stdout-json: "/home/foo\n/home/bar\n"
58
59	### Tilde expansion with brace expansion
60	# The brace expansion happens FIRST. After that, the second token has tilde
61	# FIRST, so it gets expanded. The first token has an unexpanded tilde, because
62	# it's not in the leading position.
63	# NOTE: mksh gives different behavior! So it probably doesn't matter that
64	# much...
65	HOME=/home/bob
66	echo {foo~,~}/bar
67	# stdout: foo~/bar /home/bob/bar
68	# OK mksh stdout: foo~/bar ~/bar
69
70	### Two kinds of tilde expansion
71	# ~/foo and ~bar
72	HOME=/home/bob
73	echo ~{/src,root}
74	# stdout: /home/bob/src /root
75	# OK mksh stdout: ~/src ~root
76
77	### Tilde expansion come before var expansion
78	HOME=/home/bob
79	foo=~
80	echo $foo
81	foo='~'
82	echo $foo
83	# In the second instance, we expand into a literal ~, and since var expansion
84	# comes after tilde expansion, it is NOT tried again.
85	# stdout-json: "/home/bob\n~\n"