blob: 3374ef2f4588358dc86e6d616e681d66f41c4f16 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This isn't perfect behavior, but it establishes a baseline and will provide
# a way to detect behavior changes
echo a1
a[0]= a[1]=; recho "${a[@]:-y}"
unset a
echo a2
a[1]=; recho "${a[@]:-y}"
a[1]=; recho "${a[*]:-z}"
unset a
echo a3
a[0]= a[1]=x; recho "${a[@]:-y}"
unset a
echo a4
a[0]= a[1]=x; recho ${a[@]:+y}
unset a
echo p1
set '' ''
recho "${@:-y}"
shift $#
echo p2
set '' x
recho "${@:-y}"
shift $#
echo p3
set '' x
recho ${@:+y}
# problems with * and null expansions dating back to bash's earliest days
A=(''); set -- ''
echo "<${A[*]:-X}>" "<${*:-X}>" "<${A:-X}>" "<${A[0]:-X}>"
IFS=
A=('' ''); set -- '' ''
B=''
echo "<${A[*]:-X}>" "<${*:-X}>" "<${B:-X}>" "<${B[*]:-X}>"
|
