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+.\"	$OpenBSD: cu.1,v 1.25 2023/10/03 05:20:38 jmc Exp $
+.\"
+.\" Copyright (c) 1980, 1990, 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.
+.\"
+.Dd $Mdocdate: October 3 2023 $
+.Dt CU 1
+.Os
+.Sh NAME
+.Nm cu
+.Nd serial terminal emulator
+.Sh SYNOPSIS
+.Nm
+.Op Fl dr
+.Op Fl E Ar escape_char
+.Op Fl l Ar line
+.Op Fl s Ar speed | Fl Ar speed
+.Nm
+.Op Ar host
+.Sh DESCRIPTION
+.Nm
+is used to connect to another system over a serial link.
+In the era before modern networks, it was typically used to
+connect to a modem in order to dial in to a remote host.
+It is now frequently used for tasks such as attaching to the
+serial console of another machine for administrative or
+debugging purposes.
+.Pp
+The options are as follows:
+.Bl -tag -width 4n
+.It Fl d
+Specify that the line is directly connected and
+.Nm
+should not allow the driver to block waiting for a carrier to be detected.
+.It Fl E Ar escape_char
+Specify an escape character to use instead of the default tilde.
+.It Fl l Ar line
+Specify the line to use.
+Any of the forms
+.Pa cua00 ,
+.Pa /dev/cua00 ,
+or
+.Pa usb0.1.00002.3
+are permitted.
+.Pp
+The default is
+.Pa /dev/cua00 .
+See
+.Xr cua 4
+for information on terminal devices.
+Users in group
+.Dq dialer
+are permitted to use
+.Xr cua 4
+devices by default.
+.Pp
+See
+.Xr sysctl 2
+.Va hw.ucomnames
+for available USB serial lines.
+.It Fl r
+Start
+.Nm
+in restricted mode.
+This prevents all local filesystem operations
+.Po
+.Cm ~R ,
+.Cm ~X ,
+and
+.Cm ~>
+.Pc
+and command executions
+.Po
+.Cm ~C
+and
+.Cm ~$
+.Pc .
+.It Fl s Ar speed | Fl Ar speed
+Set the speed of the connection.
+The default is 9600.
+.El
+.Pp
+If
+.Ar host
+is given,
+.Nm
+uses the
+.Xr remote 5
+database to retrieve the
+.Sy dc Pq directly connected ,
+.Sy dv Pq device
+and
+.Sy br Pq baud rate
+capabilities for that host.
+The
+.Nm
+utility ignores other capabilities found in that database.
+.Pp
+Typed characters are normally transmitted directly to the remote
+machine (which does the echoing as well).
+A tilde
+.Pq Ql ~
+appearing as the first character of a line is an escape signal; the
+following are recognized:
+.Bl -tag -offset indent -width Fl
+.It Ic ~^D No or Ic ~.
+Drop the connection and exit.
+Only the connection is dropped \(en the login session is not terminated.
+.It Ic ~>
+Copy file from local to remote.
+.Nm
+prompts for the name of a local file to transmit.
+.It Ic ~$
+Pipe the output from a local
+.Ux
+process to the remote host.
+The command string sent to the local
+.Ux
+system is processed by the shell.
+.It Ic ~#
+Send a
+.Dv BREAK
+to the remote system.
+.It Ic ~^Z
+Stop
+.Nm
+(only available with job control).
+.It Ic ~C
+Fork a child process on the local system to perform special protocols
+such as XMODEM.
+The child program will be run with the following arrangement of
+file descriptors:
+.Pp
+.Bl -item -compact -offset indent
+.It
+0 \(<> remote tty in
+.It
+1 \(<> remote tty out
+.It
+2 \(<> local tty stderr
+.El
+.It Ic ~D
+Deassert the data terminal ready (DTR) line briefly.
+.It Ic ~R
+Record all output from the remote system to a file.
+If the given file already exists, it is appended to.
+If no file is specified, any existing recording is stopped.
+.It Ic ~S
+Change the speed of the connection.
+.It Ic ~X
+Send a file with the XMODEM protocol.
+.It Ic ~?
+Get a summary of the tilde escapes.
+.El
+.Pp
+When
+.Nm
+prompts for an argument, for example during setup of a file transfer,
+the line typed may be edited with the standard erase and kill characters.
+A null line in response to a prompt, or an interrupt, will abort the
+dialogue and return the user to the remote machine.
+.Pp
+.Nm
+guards against multiple users connecting to a remote system by opening
+modems and terminal lines with exclusive access.
+.Sh ENVIRONMENT
+.Bl -tag -width REMOTEXXX
+.It Ev HOST
+The default value for
+.Ar host
+if none is specified via the command line.
+.It Ev REMOTE
+A system description, or an absolute path to a
+.Xr remote 5
+system description database.
+.El
+.Sh FILES
+.Bl -tag -width /etc/remote
+.It Pa /etc/remote
+host description file
+.El
+.Sh EXIT STATUS
+.Ex -std cu
+.Sh SEE ALSO
+.Xr sysctl 2 ,
+.Xr cua 4 ,
+.Xr remote 5
+.Sh HISTORY
+The
+.Nm
+.Pq Dq Call Unix
+command first appeared outside of Bell Labs in PWB/UNIX 1.0.
+It was reimplemented as part of the
+.Nm tip
+command in
+.Bx 4.1c .
+The current version was written for
+.Ox 5.4 .
+.Sh AUTHORS
+.An Nicholas Marriott Aq Mt nicm@openbsd.org