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Linux Change Default User Home Directory While Adding A New User

By default base directory for the system user is set to /home directory. I'd like to add user to /iscsi/home/${user} directory instead of the default /home. How do I force useradd command to add user to /iscsi/home under CentOS / RHEL / Fedora Linux server?
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Understanding /etc/passwd File Format

Can you explain /etc/passwd file format for Linux and UNIX operating systems?
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