1	#!/usr/bin/env bash
2	#
3	# Alias is in POSIX.
4	#
5	# http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_03_01
6	#
7	# Bash is the only one that doesn't support aliases!
8
9	### basic alias
10	shopt -s expand_aliases # bash requires this
11	alias hi='echo hello world'
12	hi
13	echo hi # second word is not
14	## STDOUT:
15	hello world
16	hi
17	## END
18
19	### alias with trailing space causes second alias expansion
20	shopt -s expand_aliases # bash requires this
21
22	alias hi='echo hello world '
23	alias punct='!!!'
24
25	hi punct
26
27	alias hi='echo hello world' # No trailing space
28
29	hi punct
30
31	## STDOUT:
32	hello world !!!
33	hello world punct
34	## END
35
36	### iterative alias expansion of first word
37	shopt -s expand_aliases # bash requires this
38	alias hi='echo hello world'
39	alias echo='echo --; echo '
40	hi # first hi is expanded to echo hello world; then echo is expanded. gah.
41	## STDOUT:
42	--
43	hello world
44	## END
45
46
47	### expansion of alias with value
48	shopt -s expand_aliases # bash requires this
49	x=x
50	alias echo-x='echo $x' # nothing is evaluated here
51	x=y
52	echo-x hi
53	## STDOUT:
54	y hi
55	## END
56
57
58	### first and second word are the same
59	shopt -s expand_aliases # bash requires this
60	x=x
61	alias echo-x='echo $x' # nothing is evaluated here
62	echo-x echo-x
63	## STDOUT:
64	x echo-x
65	## END
66	## BUG dash STDOUT:
67	x echo x
68	## END
69
70	### first and second word are the same with trailing space
71	shopt -s expand_aliases # bash requires this
72	x=x
73	alias echo-x='echo $x ' # nothing is evaluated here
74	echo-x echo-x
75	## STDOUT:
76	x echo x
77	## END
78
79	### defining multiple aliases, then unalias
80	shopt -s expand_aliases # bash requires this
81	x=x
82	y=y
83	alias echo-x='echo $x' echo-y='echo $y'
84	echo-x X
85	echo-y Y
86	unalias echo-x echo-y
87	echo-x X || echo undefined
88	echo-y Y || echo undefined
89	## STDOUT:
90	x X
91	y Y
92	undefined
93	undefined
94	## END
95
96
97	### Invalid syntax of alias
98	shopt -s expand_aliases # bash requires this
99	alias e= 'echo --; echo' # bad space here
100	e x
101	## status: 127
102
103	### Dynamic alias definition
104	shopt -s expand_aliases # bash requires this
105	x=x
106	name='e'
107	val='=echo'
108	alias "$name$val"
109	e X
110	## stdout: X
111
112	### Alias detection happens before expansion
113	shopt -s expand_aliases # bash requires this
114	alias e='echo'
115	cmd=e
116	e X
117	$cmd X
118	e status=$?
119	## STDOUT:
120	X
121	status=127
122	## END
123
124	### Alias name with punctuation
125	# NOTE: / is not OK in bash, but OK in other shells. Must less restrictive
126	# than var names.
127	shopt -s expand_aliases # bash requires this
128	alias e_.~x='echo'
129	e_.~x X
130	## stdout: X