OT[revised] : unix : disable a command for a particular user ?

Hi Carel & all ,
let me define my requirement clearly.
sorry about my last mail.

i have got a user TEST for the purpose
of FTP.he should not be able to login as regular user.that has been restricted.

my problem is :
while FTP-ing, he should not move to other directories other than his home directory. i want him stay rigth there and put/get his files.hope i am clear.

any solution !

Thanks and Regards,
Prem.

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