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.Dd January 21, 2010 29.Dt TALK 1 30.Os 31.Sh NAME 32.Nm talk 33.Nd talk to another user 34.Sh SYNOPSIS 35.Nm 36.Ar person 37.Op Ar ttyname 38.Sh DESCRIPTION 39The 40.Nm 41utility is a visual communication program which copies lines from your 42terminal to that of another user. 43.Pp 44Options available: 45.Bl -tag -width ttyname 46.It Ar person 47If you wish to talk to someone on your own machine, then 48.Ar person 49is just the person's login name. 50If you wish to talk to a user on 51another host, then 52.Ar person 53is of the form 54.Ql user@host 55or 56.Ql host!user 57or 58.Ql host:user . 59.It Ar ttyname 60If you wish to talk to a user who is logged in more than once, the 61.Ar ttyname 62argument may be used to indicate the appropriate terminal 63name, where 64.Ar ttyname 65is of the form 66.Ql ttyXX . 67.El 68.Pp 69When first called, 70.Nm 71sends the message 72.Bd -literal -offset indent -compact 73Message from TalkDaemon@his_machine... 74talk: connection requested by your_name@your_machine. 75talk: respond with: talk your_name@your_machine 76.Ed 77.Pp 78to the user you wish to talk to. 79At this point, the recipient 80of the message should reply by typing 81.Pp 82.Dl talk \ your_name@your_machine 83.Pp 84It does not matter from which machine the recipient replies, as 85long as his login-name is the same. 86Once communication is established, 87the two parties may type simultaneously, with their output appearing 88in separate windows. 89Typing control-L 90.Ql ^L 91will cause the screen to 92be reprinted. 93Typing control-D 94.Ql ^D 95will clear both parts of your screen to be cleared, while 96the control-D character will be sent to the remote side 97(and just displayed by this 98.Nm 99client). 100Your erase, kill, and word kill characters will 101behave normally. 102To exit, just type your interrupt character; 103.Nm 104then moves the cursor to the bottom of the screen and restores the 105terminal to its previous state. 106.Pp 107Permission to talk may be denied or granted by use of the 108.Xr mesg 1 109command. 110At the outset talking is allowed. 111.Sh FILES 112.Bl -tag -width /var/run/utx.active -compact 113.It Pa /etc/hosts 114to find the recipient's machine 115.It Pa /var/run/utx.active 116to find the recipient's tty 117.El 118.Sh SEE ALSO 119.Xr mail 1 , 120.Xr mesg 1 , 121.Xr wall 1 , 122.Xr who 1 , 123.Xr write 1 , 124.Xr talkd 8 125.Sh HISTORY 126The 127.Nm 128command appeared in 129.Bx 4.2 . 130.Pp 131In 132.Fx 5.3 , 133the default behaviour of 134.Nm 135was changed to treat local-to-local talk requests as originating 136and terminating at 137.Em localhost . 138Before this change, it was required that the hostname (as per 139.Xr gethostname 3 ) 140resolved to a valid IPv4 address (via 141.Xr gethostbyname 3 ) , 142making 143.Nm 144unsuitable for use in configurations where 145.Xr talkd 8 146was bound to the loopback interface (normally for security reasons). 147.Sh BUGS 148The version of 149.Nm 150released with 151.Bx 4.3 152uses a protocol that 153is incompatible with the protocol used in the version released with 154.Bx 4.2 . 155.Pp 156Multibyte characters are not recognized. 157