1	#
2	# Tests for pipelines.
3	# NOTE: Grammatically, ! is part of the pipeline:
4	#
5	# pipeline : pipe_sequence
6	# | Bang pipe_sequence
7
8	#### Brace group in pipeline
9	{ echo one; echo two; } | tac
10	## stdout-json: "two\none\n"
11
12	#### For loop starts pipeline
13	for w in one two; do
14	echo $w
15	done | tac
16	## stdout-json: "two\none\n"
17
18	#### While Loop ends pipeline
19	seq 3 | while read i
20	do
21	echo ".$i"
22	done
23	## stdout-json: ".1\n.2\n.3\n"
24
25	#### Redirect in Pipeline
26	echo hi 1>&2 | wc -l
27	## stdout: 0
28	## BUG zsh stdout: 1
29
30	#### Pipeline comments
31	echo abcd | # input
32	# blank line
33	tr a-z A-Z # transform
34	## stdout: ABCD
35
36	#### Exit code is last status
37	echo a | egrep '[0-9]+'
38	## status: 1
39
40	#### PIPESTATUS
41	return3() {
42	return 3
43	}
44	{ sleep 0.03; exit 1; } | { sleep 0.02; exit 2; } | { sleep 0.01; return3; }
45	echo ${PIPESTATUS[@]}
46	## stdout: 1 2 3
47	## N-I dash status: 2
48	## N-I dash stdout-json: ""
49	## N-I zsh status: 0
50	## N-I zsh stdout-json: "\n"
51
52	#### PIPESTATUS with shopt -s lastpipe
53	shopt -s lastpipe
54	return3() {
55	return 3
56	}
57	{ sleep 0.03; exit 1; } | { sleep 0.02; exit 2; } | { sleep 0.01; return3; }
58	echo ${PIPESTATUS[@]}
59	## stdout: 1 2 3
60	## N-I dash status: 2
61	## N-I dash stdout-json: ""
62	## N-I zsh status: 0
63	## N-I zsh stdout-json: "\n"
64
65	#### |&
66	stdout_stderr.py |& cat
67	## STDOUT:
68	STDERR
69	STDOUT
70	## END
71	## status: 0
72	## N-I dash/mksh stdout-json: ""
73	## N-I dash status: 2
74	## N-I osh stdout-json: ""
75	## N-I osh status: 1
76
77	#### ! turns non-zero into zero
78	! $SH -c 'exit 42'; echo $?
79	## stdout: 0
80	## status: 0
81
82	#### ! turns zero into 1
83	! $SH -c 'exit 0'; echo $?
84	## stdout: 1
85	## status: 0
86
87	#### ! in if
88	if ! echo hi; then
89	echo TRUE
90	else
91	echo FALSE
92	fi
93	## stdout-json: "hi\nFALSE\n"
94	## status: 0
95
96	#### ! with ||
97	! echo hi || echo FAILED
98	## stdout-json: "hi\nFAILED\n"
99	## status: 0
100
101	#### ! with { }
102	! { echo 1; echo 2; } || echo FAILED
103	## stdout-json: "1\n2\nFAILED\n"
104	## status: 0
105
106	#### ! with ( )
107	! ( echo 1; echo 2 ) || echo FAILED
108	## stdout-json: "1\n2\nFAILED\n"
109	## status: 0
110
111	#### ! is not a command
112	v='!'
113	$v echo hi
114	## status: 127
115
116	#### Evaluation of argv[0] in pipeline occurs in child
117	${cmd=echo} hi | wc -l
118	echo "cmd=$cmd"
119	## STDOUT:
120	1
121	cmd=
122	## END
123	## BUG zsh STDOUT:
124	1
125	cmd=echo
126	## END
127
128	#### bash/dash/mksh run the last command is run in its own process
129	echo hi | read line
130	echo "line=$line"
131	## stdout: line=hi
132	## OK bash/dash/mksh stdout: line=
133
134	#### shopt -s lastpipe (always on in OSH)
135	shopt -s lastpipe
136	echo hi | read line
137	echo "line=$line"
138	## stdout: line=hi
139	## N-I dash/mksh stdout: line=
140
141	#### shopt -s lastpipe (always on in OSH)
142	shopt -s lastpipe
143	i=0
144	seq 3 | while read line; do
145	(( i++ ))
146	done
147	echo i=$i
148	## stdout: i=3
149	## N-I dash/mksh stdout: i=0
150
151
152	#### SIGPIPE causes pipeline to die (regression for issue #295)
153	cat /dev/urandom | sleep 0.1
154	echo ${PIPESTATUS[@]}
155
156	# hm bash gives '1 0' which seems wrong
157
158	## STDOUT:
159	141 0
160	## END
161	## BUG bash STDOUT:
162	1 0
163	## END
164	## N-I zsh stdout:
165	## N-I dash status: 2
166	## N-I dash stdout-json: ""