1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)tee.1 8.1 (Berkeley) 6/6/93 32.\" $FreeBSD$ 33.\" 34.Dd October 30, 2022 35.Dt TEE 1 36.Os 37.Sh NAME 38.Nm tee 39.Nd duplicate standard input 40.Sh SYNOPSIS 41.Nm 42.Op Fl ai 43.Op Ar 44.Sh DESCRIPTION 45The 46.Nm 47utility copies standard input to standard output, 48making a copy in zero or more files. 49The output is unbuffered. 50.Pp 51The following options are available: 52.Bl -tag -width indent 53.It Fl a 54Append the output to the files rather than 55overwriting them. 56.It Fl i 57Ignore the 58.Dv SIGINT 59signal. 60.El 61.Pp 62The following operands are available: 63.Bl -tag -width indent 64.It Ar file 65A pathname of an output 66.Ar file . 67.El 68.Pp 69The 70.Nm 71utility takes the default action for all signals, 72except in the event of the 73.Fl i 74option. 75.Sh EXIT STATUS 76.Ex -std 77.Sh EXAMPLES 78Send the echoed message both to stdout and to the 79.Pa greetings.txt 80file: 81.Bd -literal -offset indent 82$ echo "Hello" | tee greetings.txt 83Hello 84.Ed 85.Sh STANDARDS 86The 87.Nm 88utility is expected to be 89.St -p1003.2 90compatible. 91.Sh HISTORY 92The 93.Nm 94command first appeared in 95.At v7 . 96