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- How to set username and password never to expire.
- Why can/etc/passwd and /etc/shadow files can not be merged into 1 file?
- how to list all the files opened by a particular PID ?
- if we are unable to unmount the file system. what is the reason behind it ?
- what could be the reason if the server takes more time after reboot?
- what are kernel routing tables in Linux?
