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bash: ulimit: core file size: cannot modify limit: Operation not permitted

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http://forums.fedoraforum.org – Hello, Fedora 12 gcc 4.4.1 I am doing some programming, and my program gave me a stack dump. However, there is no core file for me to examine. So I did: Code: ulimit -c unlimited and got this error message: Code: bash: ulimit: core file size: cannot modify limit: Operation not permitted I also tried setting ulimit to 50000 and still got the same error. The results of ulimit -a: Code: $ 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) 12275 max locked memory      (kbytes, -l) 64 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) 1024 virtual memory          (kbytes, -v) unlimited file locks                      (-x) unlimited I am not sure what else to do, Many thanks for any suggestions, (HowTos)