Importing usr.bin/tty

Replaces commands/tty. No Minix-specific changes needed.

Change-Id: I7ed8589a8cfb0f4fedab6eb760e321876db73502

man/man1/Makefile

@@ -19,7 +19,7 @@ MAN=	ash.1 at.1 \
 	stty.1 svc.1 svrctl.1 \
 	synctree.1 sysenv.1 sz.1 tail.1 telnet.1 template.1 \
 	term.1 termcap.1 tget.1 time.1 true.1 \
-	truncate.1 tty.1 umount.1 uname.1 \
+	truncate.1 umount.1 uname.1 \
 	uud.1 uue.1 vol.1 whereis.1 which.1 \
 	yap.1 linkfarm.1 pkg_view.1
 

man/man1/tty.1

@@ -1,30 +0,0 @@
-.TH TTY 1
-.SH NAME
-tty \- print the device name of this tty
-.SH SYNOPSIS
-\fBtty \fR[\fB\-s\fR]\fR
-.br
-.de FL
-.TP
-\\fB\\$1\\fR
-\\$2
-..
-.de EX
-.TP 20
-\\fB\\$1\\fR
-# \\$2
-..
-.SH OPTIONS
-.TP 5
-.B \-s
-# Silent mode, only the exit status is affected.
-.SH EXAMPLES
-.TP 20
-.B tty
-# Print the tty name
-.SH DESCRIPTION
-.PP
-Print the name of the controlling tty. If the flag \fB\-s\fR is given,
-\fItty\fR is equivalent to the call \fBtest \-t 0\fR.
-.SH "SEE ALSO"
-.BR ttyname (3).