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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)talk.1 8.1 (Berkeley) 6/6/93 33.\" $FreeBSD$ 34.\" 35.Dd July 3, 2004 36.Dt TALK 1 37.Os 38.Sh NAME 39.Nm talk 40.Nd talk to another user 41.Sh SYNOPSIS 42.Nm 43.Ar person 44.Op Ar ttyname 45.Sh DESCRIPTION 46The 47.Nm 48utility is a visual communication program which copies lines from your 49terminal to that of another user. 50.Pp 51Options available: 52.Bl -tag -width ttyname 53.It Ar person 54If you wish to talk to someone on your own machine, then 55.Ar person 56is just the person's login name. 57If you wish to talk to a user on 58another host, then 59.Ar person 60is of the form 61.Ql user@host 62or 63.Ql host!user 64or 65.Ql host:user . 66.It Ar ttyname 67If you wish to talk to a user who is logged in more than once, the 68.Ar ttyname 69argument may be used to indicate the appropriate terminal 70name, where 71.Ar ttyname 72is of the form 73.Ql ttyXX . 74.El 75.Pp 76When first called, 77.Nm 78sends the message 79.Bd -literal -offset indent -compact 80Message from TalkDaemon@his_machine... 81talk: connection requested by your_name@your_machine. 82talk: respond with: talk your_name@your_machine 83.Ed 84.Pp 85to the user you wish to talk to. 86At this point, the recipient 87of the message should reply by typing 88.Pp 89.Dl talk \ your_name@your_machine 90.Pp 91It does not matter from which machine the recipient replies, as 92long as his login-name is the same. 93Once communication is established, 94the two parties may type simultaneously, with their output appearing 95in separate windows. 96Typing control-L 97.Ql ^L 98will cause the screen to 99be reprinted. 100Typing control-D 101.Ql ^D 102will clear both parts of your screen to be cleared, while 103the control-D character will be sent to the remote side 104(and just displayed by this 105.Nm 106client). 107Your erase, kill, and word kill characters will 108behave normally. 109To exit, just type your interrupt character; 110.Nm 111then moves the cursor to the bottom of the screen and restores the 112terminal to its previous state. 113.Pp 114Permission to talk may be denied or granted by use of the 115.Xr mesg 1 116command. 117At the outset talking is allowed. 118.Sh FILES 119.Bl -tag -width /var/run/utmp -compact 120.It Pa /etc/hosts 121to find the recipient's machine 122.It Pa /var/run/utmp 123to find the recipient's tty 124.El 125.Sh SEE ALSO 126.Xr mail 1 , 127.Xr mesg 1 , 128.Xr wall 1 , 129.Xr who 1 , 130.Xr write 1 , 131.Xr talkd 8 132.Sh HISTORY 133The 134.Nm 135command appeared in 136.Bx 4.2 . 137.Pp 138In 139.Fx 5.3 , 140the default behaviour of 141.Nm 142was changed to treat local-to-local talk requests as originating 143and terminating at 144.Em localhost . 145Before this change, it was required that the hostname (as per 146.Xr gethostname 3 ) 147resolved to a valid IPv4 address (via 148.Xr gethostbyname 3 ) , 149making 150.Nm 151unsuitable for use in configurations where 152.Xr talkd 8 153was bound to the loopback interface (normally for security reasons). 154.Sh BUGS 155The version of 156.Nm 157released with 158.Bx 4.3 159uses a protocol that 160is incompatible with the protocol used in the version released with 161.Bx 4.2 . 162.Pp 163Multibyte characters are not recognized. 164