Enable generating core dump file on Debian Linux

The default core dump file size is 0 on Debian Linux:

$ ulimit -c
0

To enable generating core dump file, I need to run following command:

$ ulimit -c unlimited  

But if you re-login, the core dump file size is changed back to 0 from unlimited. So “ulimit -c unlimited” need to be executed during your login. E.g., if you use zsh, append it in .zshrc file.

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