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+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" resizewin
+.\"
+.\" Query terminal for size and inform the kernel
+.\"
+.\" Copyright 2015 EMC / Isilon Storage Division
+.\"
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 May 9, 2017
+.Dt RESIZEWIN 1
+.Os
+.Sh NAME
+.Nm resizewin
+.Nd update terminal size
+.Sh SYNOPSIS
+.Nm
+.Op Fl z
+.Sh DESCRIPTION
+The
+.Nm
+utility
+queries the terminal emulator for the current window size and updates
+the size known to the kernel using the
+.Dv TIOCSWINSZ
+ioctl.
+.Pp
+The following options are available:
+.Bl -tag -width "-z"
+.It Fl z
+Do nothing unless the current kernel terminal size is zero.
+This is useful when run from a user's profile (shell startup) scripts:
+querying the window size is required for serial lines, but not when
+logging in over the network, as protocols like TELNET or SSH already
+handle the terminal size by themselves.
+.El
+.Pp
+After a terminal window has been resized, running
+.Nm
+updates the kernel's window size to match the new size.
+.Pp
+.Nm
+is functionally similar to
+.Xr resize 1 ,
+which is part of the
+.Xr xterm 1 Pq Pa ports/x11/xterm
+distribution.
+However,
+.Nm
+only works with VT100/ANSI-compatible terminals and does not emit
+commands to set environment variables.
+.Pp
+The terminal is assumed to be VT100/ANSI compatible.
+The VT100/ANSI escape sequences are supported by virtually all modern
+terminals, including xterm, konsole, gnome-terminal, iTerm,
+Terminal.app, and PuTTY.
+.Sh SEE ALSO
+.Xr stty 1 ,
+.Xr tty 4
+.Sh HISTORY
+The
+.Nm
+command first appeared in
+.Fx 11.0 .