locking down a users privileges

[Grant Cooper]

I am trying to prevent a user from leaving his directory. I set something up
last year where I just added a name to a file. But I forgot the name of the
file.

For another box I wanted to use putty to connect to my freebsd server and
was wondering if there was a shell I could use where the user couldn't do
anything in his account. Only want the user to be able to login and use the
mysql program.

Should I use jail or chroot or something else?