1	#!/bin/bash
2	#
3	# Test the if statement
4
5	### If
6	if true; then
7	echo if
8	fi
9	# stdout: if
10
11	### else
12	if false; then
13	echo if
14	else
15	echo else
16	fi
17	# stdout: else
18
19	### elif
20	if (( 0 )); then
21	echo if
22	elif true; then
23	echo elif
24	else
25	echo else
26	fi
27	# stdout: elif
28
29	### Long style
30	if [[ 0 -eq 1 ]]
31	then
32	echo if
33	echo if
34	elif true
35	then
36	echo elif
37	else
38	echo else
39	echo else
40	fi
41	# stdout: elif
42
43	# Weird case from bash-help mailing list.
44	#
45	# "Evaluations of backticks in if statements". It doesn't relate to if
46	# statements but to $?, since && and || behave the same way.
47
48	### If empty command
49	if ''; then echo TRUE; else echo FALSE; fi
50	# stdout: FALSE
51	# status: 0
52
53	### If subshell true
54	if `true`; then echo TRUE; else echo FALSE; fi
55	# stdout: TRUE
56	# status: 0
57
58	### If subshell true WITH OUTPUT is different
59	if `sh -c 'echo X; true'`; then echo TRUE; else echo FALSE; fi
60	# stdout: FALSE
61	# status: 0
62
63	### If subshell true WITH ARGUMENT
64	if `true` X; then echo TRUE; else echo FALSE; fi
65	# stdout: FALSE
66	# status: 0
67
68	### If subshell false
69	if `false`; then echo TRUE; else echo FALSE; fi
70	# stdout: FALSE
71	# status: 0