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i don't think this can be done, for you must be able to read /usr/bin, /usr/lib etc to be able to run anything for that user (a desktop manager for starters!). the only way is to create, perhaps an entire system in a hidden folder (eg. /home/user/.sys/)..... no that won't work either!
Check out the various options for restricted shells. Both bash and (I think) ksh have a way that they can work in restricted mode (don't allow a user to cd or run any command outside his $PATH). If you grep for rbash you'll find some good info, I think. I'm not sure if this will prevent the user from ls'ing other dirs though, so it may not be as secure as a chroot jail, but easier to set up.