1	#!/bin/bash
2
3	#### tuple comparison
4	var t1 = 3, 0
5	var t2 = 4, 0
6	var t3 = 3, 1
7
8	if (t2 > t1) { echo yes1 }
9	if (t3 > t1) { echo yes2 }
10	if ( (0,0) > t1) { echo yes3 }
11
12	# NOTE: ((0,0) causes problems -- it looks like a shell statement!
13	#if ( (0,0) > t1) { echo yes3 }
14	## STDOUT:
15	yes1
16	yes2
17	## END
18
19
20	#### tuple literal doesn't conflict with ((
21	if ((0,0) < (0,1)) { echo yes }
22	## STDOUT:
23	yes
24	## END
25
26	#### Empty tuple
27	var t = ()
28	echo length=$len(t)
29	## STDOUT:
30	length=0
31	## END
32
33	#### Singleton tuple
34	var t = tup(42)
35	echo "length = $[len(t)]"
36	echo "t[0] = $[t[0]]"
37
38	# NOT ALLOWED. Use tup() instead.
39	#var t1 = 1,
40	var t2 = (1,)
41	## status: 2
42	## STDOUT:
43	length = 1
44	t[0] = 42
45	## END