cbenable_core_dumps does not enable core dumps for all users in centos 5.x

as you see i ran this a few times and it did not change the core file size limit

[root@localhost bin]# ./cbenable_core_dumps.sh /tmp/
[root@localhost bin]# ./cbenable_core_dumps.sh /tmp/
[root@localhost bin]# ulimit -n
1024
[root@localhost bin]# ulimit -n
1024
[root@localhost bin]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 32768
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 32768
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[root@localhost bin]# ./cbenable_core_dumps.sh /tmp/
[root@localhost bin]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 32768
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 32768
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[root@localhost bin]# ./cbenable_core_dumps.sh /tmp/
[root@localhost bin]# sudo
[root@localhost bin]# ./cbenable_core_dumps.sh /tmp/
[root@localhost bin]# cat /etc/issue
CentOS release 5.7 (Final)
Kernel \r on an \m

[root@localhost bin]#