4 files changed, 164 insertions, 0 deletions
diff --git a/usr.bin/tty/Makefile b/usr.bin/tty/Makefile
new file mode 100644
index 000000000000..e0e47132f825
--- /dev/null
+++ b/usr.bin/tty/Makefile
@@ -0,0 +1,3 @@
+PROG=	tty
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/tty/Makefile.depend b/usr.bin/tty/Makefile.depend
new file mode 100644
index 000000000000..93249906da4f
--- /dev/null
+++ b/usr.bin/tty/Makefile.depend
@@ -0,0 +1,14 @@
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+	include \
+	lib/${CSU_DIR} \
+	lib/libc \
+	lib/libcompiler_rt \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif
diff --git a/usr.bin/tty/tty.1 b/usr.bin/tty/tty.1
new file mode 100644
index 000000000000..9839cfd0cc13
--- /dev/null
+++ b/usr.bin/tty/tty.1
@@ -0,0 +1,80 @@
+.\" Copyright (c) 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Institute of Electrical and Electronics Engineers, Inc.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd June 6, 1993
+.Dt TTY 1
+.Os
+.Sh NAME
+.Nm tty
+.Nd return user's terminal name
+.Sh SYNOPSIS
+.Nm
+.Op Fl s
+.Sh DESCRIPTION
+The
+.Nm
+utility writes the name of the terminal attached to standard input
+to standard output.
+The name that is written is the string returned by
+.Xr ttyname 3 .
+If the standard input is not a terminal, the message
+.Dq Li "not a tty"
+is written.
+The options are as follows:
+.Bl -tag -width indent
+.It Fl s
+Do not write the terminal name; only the exit status is affected
+when this option is specified.
+The
+.Fl s
+option is deprecated in favor of the
+.Dq Li "test -t 0"
+command.
+.El
+.Sh EXIT STATUS
+The
+.Nm
+utility
+exits 0 if the standard input is a terminal, 1 if the standard input is
+not a terminal, and >1 if an error occurs.
+.Sh SEE ALSO
+.Xr test 1 ,
+.Xr ttyname 3
+.Sh STANDARDS
+The
+.Nm
+utility is expected to be
+.St -p1003.2
+compatible.
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v1 .
diff --git a/usr.bin/tty/tty.c b/usr.bin/tty/tty.c
new file mode 100644
index 000000000000..a77dca6ca653
--- /dev/null
+++ b/usr.bin/tty/tty.c
@@ -0,0 +1,67 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void usage(void) __dead2;
+
+int
+main(int argc, char *argv[])
+{
+	int ch, sflag;
+	char *t;
+
+	sflag = 0;
+	while ((ch = getopt(argc, argv, "s")) != -1)
+		switch (ch) {
+		case 's':
+			sflag = 1;
+			break;
+		case '?':
+		default:
+			usage();
+			/* NOTREACHED */
+		}
+
+	t = ttyname(STDIN_FILENO);
+	if (!sflag)
+		puts(t ? t : "not a tty");
+	exit(t ? EXIT_SUCCESS : EXIT_FAILURE);
+}
+
+static void
+usage(void)
+{
+	fprintf(stderr, "usage: %s [-s]\n", getprogname());
+	exit(2);
+}