Second Interview (was OS focused): Can you explain the Linux boot process?, How do you install a package in Ubuntu? What does apt-get update do? What does apt-get upgrade do? What ports are used for SSH, SSL and what is the default MySQL port?(repetition from first interview), How do you make a user the owner of a file in Linux? How do you change permissions? What is the meaning of the various codes used in assigning permissions in chmod and what does each position signify?, How do you connect a new disk partition and mount it in Linux?, What is iptables? What is an inode?