1	#### $SHELL set to login shell
2
3	sh=$(which $SH)
4
5	unset SHELL
6
7	prog='
8	if test -n "$SHELL"; then
9	# the exact value is different on CI, so do not assert
10	echo SHELL is set
11	echo SHELL=$SHELL >&2
12	fi
13	'
14
15	$SH -c "$prog"
16
17	# make it a login shell
18	$SH -l -c "$prog"
19
20	## STDOUT:
21	SHELL is set
22	SHELL is set
23	## END
24	## N-I dash/mksh/zsh STDOUT:
25	SHELL=
26	SHELL=
27	## END