3 tty \- print the device name of this tty
5 \fBtty \fR[\fB\-s\fR]\fR
20 # Silent mode, only the exit status is affected.
27 Print the name of the controlling tty. If the flag \fB\-s\fR is given,
28 \fItty\fR is equivalent to the call \fBtest \-t 0\fR.