.CD "tty \(en print the device name of this tty"
.SX "tty \fR[\fB\(ens\fR]"
.FL "\(ens" "Silent mode, only the exit status is affected."
.EY "tty~~~" "Print the tty name"
.PP
Print the name of the controlling tty. If the flag \fB\(ens\fR is given,
\fItty\fR is equivalent to the call \fBtest \(ent 0\fR.