1.\" Copyright (c) 1983, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)talk.1 8.1 (Berkeley) 6/6/93 29.\" $FreeBSD$ 30.\" 31.Dd January 21, 2010 32.Dt TALK 1 33.Os 34.Sh NAME 35.Nm talk 36.Nd talk to another user 37.Sh SYNOPSIS 38.Nm 39.Ar person 40.Op Ar ttyname 41.Sh DESCRIPTION 42The 43.Nm 44utility is a visual communication program which copies lines from your 45terminal to that of another user. 46.Pp 47Options available: 48.Bl -tag -width ttyname 49.It Ar person 50If you wish to talk to someone on your own machine, then 51.Ar person 52is just the person's login name. 53If you wish to talk to a user on 54another host, then 55.Ar person 56is of the form 57.Ql user@host 58or 59.Ql host!user 60or 61.Ql host:user . 62.It Ar ttyname 63If you wish to talk to a user who is logged in more than once, the 64.Ar ttyname 65argument may be used to indicate the appropriate terminal 66name, where 67.Ar ttyname 68is of the form 69.Ql ttyXX . 70.El 71.Pp 72When first called, 73.Nm 74sends the message 75.Bd -literal -offset indent -compact 76Message from TalkDaemon@his_machine... 77talk: connection requested by your_name@your_machine. 78talk: respond with: talk your_name@your_machine 79.Ed 80.Pp 81to the user you wish to talk to. 82At this point, the recipient 83of the message should reply by typing 84.Pp 85.Dl talk \ your_name@your_machine 86.Pp 87It does not matter from which machine the recipient replies, as 88long as his login-name is the same. 89Once communication is established, 90the two parties may type simultaneously, with their output appearing 91in separate windows. 92Typing control-L 93.Ql ^L 94will cause the screen to 95be reprinted. 96Typing control-D 97.Ql ^D 98will clear both parts of your screen to be cleared, while 99the control-D character will be sent to the remote side 100(and just displayed by this 101.Nm 102client). 103Your erase, kill, and word kill characters will 104behave normally. 105To exit, just type your interrupt character; 106.Nm 107then moves the cursor to the bottom of the screen and restores the 108terminal to its previous state. 109.Pp 110Permission to talk may be denied or granted by use of the 111.Xr mesg 1 112command. 113At the outset talking is allowed. 114.Sh FILES 115.Bl -tag -width /var/run/utx.active -compact 116.It Pa /etc/hosts 117to find the recipient's machine 118.It Pa /var/run/utx.active 119to find the recipient's tty 120.El 121.Sh SEE ALSO 122.Xr mail 1 , 123.Xr mesg 1 , 124.Xr wall 1 , 125.Xr who 1 , 126.Xr write 1 , 127.Xr talkd 8 128.Sh HISTORY 129The 130.Nm 131command appeared in 132.Bx 4.2 . 133.Pp 134In 135.Fx 5.3 , 136the default behaviour of 137.Nm 138was changed to treat local-to-local talk requests as originating 139and terminating at 140.Em localhost . 141Before this change, it was required that the hostname (as per 142.Xr gethostname 3 ) 143resolved to a valid IPv4 address (via 144.Xr gethostbyname 3 ) , 145making 146.Nm 147unsuitable for use in configurations where 148.Xr talkd 8 149was bound to the loopback interface (normally for security reasons). 150.Sh BUGS 151The version of 152.Nm 153released with 154.Bx 4.3 155uses a protocol that 156is incompatible with the protocol used in the version released with 157.Bx 4.2 . 158.Pp 159Multibyte characters are not recognized. 160