02-23-2001
1) Since the 'cd' command is a shell builtin, you would have to write (or modify) your own shell to remove the ability to change directories with this command. An alternative might be to have his login script run a program which calls the chroot() system call. do a 'man chroot' for information.
I suggest finding a local Unix guru to help you.
2) Contact an ISP and pay them to put your DNS info in their servers, or look into using <A HREF="http://soa.granitecanyon.com/">The Public DNS Service</A>.
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CHROOT(1) User Commands CHROOT(1)
NAME
chroot - run command or interactive shell with special root directory
SYNOPSIS
chroot NEWROOT [COMMAND [ARG]...]
chroot OPTION
DESCRIPTION
Run COMMAND with root directory set to NEWROOT.
--help display this help and exit
--version
output version information and exit
If no command is given, run ``${SHELL} -i'' (default: /bin/sh).
AUTHOR
Written by Roland McGrath.
REPORTING BUGS
Report chroot bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
chroot(2)
The full documentation for chroot is maintained as a Texinfo manual. If the info and chroot programs are properly installed at your site,
the command
info coreutils 'chroot invocation'
should give you access to the complete manual.
GNU coreutils 7.1 July 2010 CHROOT(1)