How do i enable and disable services like ftp,telnet,finger,rlogin,rsh,xdmcp for different users depending on the user login?i want to do this programmatically.i mean i want to know if there are any commands that can be performed to achieve this.thank u.

are you referring to those commands or the actual servers?

are you referring to those commands or the actual servers?

yes,i am referring to the commands coz i want to write code to enable and disable the services.

I would create a group and add your 'allowed' users to it. Then change the perms on the files so that they are executable by that group (ie, remove the Other perms). No code necessary. Just add the users to that group and they should be able to use that program.

Thank u sir.but can u tell me on which 'files' u want me to change the permissions.

That depends on which services you want to disable.

If you want to disable telnet, the command will tell you the abolute path of telnet on your machine. Oh my machine it shows: The first one is the executable (binary) file, the second one is the manpage. will list the owner (root), group (probably also root) and the permissions of the file. You should change the group to your special group name (e.g. special) and adjust the permissions so that only the group and root has permission to execute the binary. The commands are (you must have root privileges):
You have to repeat that for every service you want to restrict.

thank u sir.