Firstly the shell in /etc doesn't include an argument setting so you want to run /bin/rbash (and link bash to rbash)
Try that to, but putty refuses to log on with rbash console. Why? Anything else?
Secondly you'll need to carefully set up your apps to have no holes Thirdly make sure that they cant redirect into their own home directory files (make the dir r/o and the files r/o)
Will do that.
Finally if you want them to use things like ftp you'll need to put /bin/rbash into /etc/shells. You may well not want to do that bit of course. Alan
Thx for feedback!