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
|
# test the trap code
trap 'echo exiting' 0
trap 'echo aborting' 1 2 3 6 15
# make sure a user-specified subshell runs the exit trap, but does not
# inherit the exit trap from a parent shell
( trap 'echo subshell exit' 0; exit 0 )
( exit 0 )
trap
func()
{
trap 'echo [$LINENO] funcdebug' DEBUG
echo funcdebug line
}
trap 'echo [$LINENO] debug' DEBUG
echo debug line
trap
func
trap
trap '' DEBUG
trap
trap - debug
trap
trap - HUP
trap hup
trap '' INT
trap '' int
trap
# hmmm...should this set the handling to SIG_IGN for children, too?
trap '' USR2
./trap1.sub
#
# show that setting a trap on SIGCHLD is not disastrous.
#
set -o monitor
trap 'echo caught a child death' SIGCHLD
sleep 7 & sleep 6 & sleep 5 &
wait
trap -p SIGCHLD
# Now reset some of the signals the shell handles specially back to
# their default values (with or without the SIG prefix)
trap SIGINT QUIT TERM
trap
|
