a tty????

rasejo · 10-04-2002, 12:20 AM

hello,

Sorry for this very simple question i have to ask... what is tty?
can anyone give me a link which would explain details regarding tty's?

GT I.N.C · 10-04-2002, 12:26 AM

tty means serial port i'm pretty sure, this usual has something to do with the modem connection....why do you ask?

try searching around in the forums....

Garry

neo77777 · 10-04-2002, 12:34 AM

It is a little bit wrong, ttyS is a serial port (COM port) , tty is a file name of a terminal connected to standard input (keyboards for instance), so basically this is a terminal, Xterm for instance is a program to emulate *NIX terminal.
apropos tty
man tty

rasejo · 10-04-2002, 01:07 AM

ah ok...
Is is true that one way to secure you linux box is to limit the virtual terminals and tty on the securetty?
And why are the tty's from 1 to 11 only? Does it corresponds to a certain standard input?

neo77777 · 10-04-2002, 01:59 AM

I am not sure about maximum numbers of tty's you can run on your system, but it is well beyond 11, as for virtual terminals, yes it is believed a good security practice to limit number of vtty's on your system, usually you can limit them in /etc/inittab, also you can restrict root access on vtty's and tty's through /etc/securetty

m4rtin · 02-23-2009, 01:01 AM

Quote:

Originally Posted by neo77777

It is a little bit wrong, ttyS is a serial port (COM port) , tty is a file name of a terminal connected to standard input (keyboards for instance), so basically this is a terminal, Xterm for instance is a program to emulate *NIX terminal.
apropos tty
man tty

for example if i have 5 Virtual Terminals, 5 xterm windows and 5 gnome-terminals in use, then I have tty0 - tty14 in use?

And does tty's pass information to shell(for example bash or tcsh) and shell passes information back to tty's?