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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
# 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/>.
#
cd ${TMPDIR:=/var/tmp}
rm -f u
${THIS_SH} -c 'exec 10>&1; echo fd 10 >&10' 10>u
cat u
rm -f u
${THIS_SH} -c 'exec 8>&1; echo fd 8 >&8' 8>u
cat u
rm -f u
# command preceding exec acts as if `command' isn't there
${THIS_SH} -c 'command exec 10>&1; echo fd 10 >&10; echo next fd' 10>u
cat u
rm -f u
exec 10>u
exec 10>&1; echo 'fd 10' >&10
cat u
rm -f u
exec 10>&-
exec 8>u
exec 8>&1; echo 'fd 8' >&8
cat u
rm -f u
exec 8>&-
rm -f infile
cat > infile <<EOF
1
2
3
4
EOF
exec 7<&0
exec 10<infile
exec 0<&10; cat <&10
exec 0<&7
exec 7<&-
exec 7<&0
exec 8<infile
exec 0<&8 ; cat <&8
exec 0<&7
exec 7<&-
exec 7<&0
exec 0</dev/null
exec 10<infile
exec 10<&0; cat <&10
exec 0<&7
exec 7<&-
exec 7<&0
exec 0</dev/null
exec 8<infile
exec 8<&0; cat <&8
exec 0<&7
exec 7<&-
rm -f infile
cd $OLDPWD
exit 0
|
