08-21-2008
I'm not familiar with the type of obscure trick you're implying.
However, I could give you some advise on how to do something similar. Bash has a mode in which users shall not exit their home dir (RESTRICTED MODE). This mode can be activated by calling bash with another name (rbash -- which is simply a symlink to bash) or doing bash -r . Although this restrictions work fine under normal usage, they are only a barrier to dummy users because any programmer could bypass them all.
Alternatively you could try more reliable methods such as virtualization (f.e. xen).
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LEARN ABOUT DEBIAN
lusermod
lusermod(8) System Manager's Manual lusermod(8)
NAME
lusermod - Modify an user
SYNOPSIS
lusermod [OPTION]... user
DESCRIPTION
Modifies the user with name user.
OPTIONS
-c, --gecos=gecos
Set user's GECOS field to gecos. The GECOS field is traditionally used to store user's real name and other information.
-d, --directory=directory
Set user's home directory to directory.
-g, --gid=gid
Change user's primary group ID to gid. If group with ID gid does not exist, a warning is printed, but the operation is performed
anyway.
-i, --interactive
Ask all questions when connecting to the user database, even if default answers are set up in libuser configuration.
-L, --lock
Lock user's account. This prevents logging in using user's password.
-l, --login=name
Rename user to name.
-m, --movedirectory
After changing user's home directory (using the -d option), move the old home directory to the new location.
-P, --plainpassword=password
Set user's password to password. Note that the password can be viewed while running lusermod using tools such as ps(1).
-p, --password=encrypted
Set user's password to the password represented by the hash encrypted. Note that the hash can be viewed while running lusermod
using tools such as ps(1).
-s, --shell=shell
Set user's login shell to shell.
-U, --unlock
Unlock user's account.
-u, --uid=uid
Change user's user ID to uid.
EXIT STATUS
The exit status is 0 on success, nonzero on error.
libuser Feb 27 2008 lusermod(8)