.\" Copyright (c) 1989, 1993
.\"	The Regents of the University of California.  All rights reserved.
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.\" This code is derived from software contributed to Berkeley by
.\" Jef Poskanzer and Craig Leres of the Lawrence Berkeley Laboratory.
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.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"     @(#)write.1	8.1 (Berkeley) 6/6/93
.\" $FreeBSD: head/usr.bin/write/write.1 314436 2017-02-28 23:42:47Z imp $
.\"
.Dd February 13, 2012
.Dt WRITE 1
.Os
.Sh NAME
.Nm write
.Nd send a message to another user
.Sh SYNOPSIS
.Nm
.Ar user
.Op Ar tty
.Sh DESCRIPTION
The
.Nm
utility allows you to communicate with other users, by copying lines from
your terminal to theirs.
.Pp
When you run the
.Nm
command, the user you are writing to gets a message of the form:
.Pp
.Dl Message from yourname@yourhost on yourtty at hh:mm ...
.Pp
Any further lines you enter will be copied to the specified user's
terminal.
If the other user wants to reply, they must run
.Nm
as well.
.Pp
When you are done, type an end-of-file or interrupt character.
The other user will see the message
.Ql EOF
indicating that the
conversation is over.
.Pp
You can prevent people (other than the super-user) from writing to you
with the
.Xr mesg 1
command.
.Pp
If the user you want to write to is logged in on more than one terminal,
you can specify which terminal to write to by specifying the terminal
name as the second operand to the
.Nm
command.
Alternatively, you can let
.Nm
select one of the terminals \- it will pick the one with the shortest
idle time.
This is so that if the user is logged in at work and also dialed up from
home, the message will go to the right place.
.Pp
The traditional protocol for writing to someone is that the string
.Ql \-o ,
either at the end of a line or on a line by itself, means that it is the
other person's turn to talk.
The string
.Ql oo
means that the person believes the conversation to be
over.
.Sh SEE ALSO
.Xr mesg 1 ,
.Xr talk 1 ,
.Xr wall 1 ,
.Xr who 1
.Sh HISTORY
A
.Nm
command appeared in
.At v1 .
.Sh BUGS
The sender's
.Ev LC_CTYPE
setting is used to determine which characters are safe to write to a
terminal, not the receiver's (which
.Nm
has no way of knowing).