1	#!/bin/bash
2
3	### case
4	foo=a; case $foo in [0-9]) echo number;; [a-z]) echo letter;; esac
5	# stdout: letter
6
7	### case in subshell
8	# Hm this subhell has to know about the closing ) and stuff like that.
9	# case_clause is a compound_command, which is a command. And a subshell
10	# takes a compound_list, which is a list of terms, which has and_ors in them
11	# ... which eventually boils down to a command.
12	echo $(foo=a; case $foo in [0-9]) echo number;; [a-z]) echo letter;; esac)
13	# stdout: letter
14
15	### Command sub word part
16	# "The token shall not be delimited by the end of the substitution."
17	foo=FOO; echo $(echo $foo)bar$(echo $foo)
18	# stdout: FOObarFOO
19
20	### Backtick
21	foo=FOO; echo `echo $foo`bar`echo $foo`
22	# stdout: FOObarFOO
23
24	### Backtick 2
25	echo `echo -n l; echo -n s`
26	# stdout: ls
27
28	### Nested backticks
29	# Inner `` are escaped! # Not sure how to do triple.. Seems like an unlikely
30	# use case. Not sure if I even want to support this!
31	echo X > $TMP/000000-first
32	echo `\`echo -n l; echo -n s\` $TMP | head -n 1`
33	# stdout: 000000-first
34
35	### Making command out of command sub should work
36	# Works in bash and dash!
37	$(echo ec)$(echo ho) split builtin
38	# stdout: split builtin
39
40	### Making keyword out of command sub should NOT work
41	# This doesn't work in bash or dash! Hm builtins are different than keywords /
42	# reserved words I guess.
43	# dash fails, but gives code 0
44	$(echo f)$(echo or) i in a b c; do echo $i; done
45	# status: 2
46	# BUG dash status: 0
47	# OK mksh status: 1
48
49	### Command sub with here doc
50	echo $(<<EOF tac
51	one
52	two
53	EOF
54	)
55	# stdout: two one
56
57	### Here doc with pipeline
58	<<EOF tac | tr '\n' 'X'
59	one
60	two
61	EOF
62	# stdout-json: "twoXoneX"
63
64	### Command Sub word split
65	argv.py $(echo 'hi there') "$(echo 'hi there')"
66	# stdout: ['hi', 'there', 'hi there']
67
68	### Command Sub trailing newline removed
69	s=$(python -c 'print "ab\ncd\n"')
70	argv "$s"
71	# stdout: ['ab\ncd']
72
73	### Command Sub trailing whitespace not removed
74	s=$(python -c 'print "ab\ncd\n "')
75	argv "$s"
76	# stdout: ['ab\ncd\n ']