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.\" 33.Dd October 30, 2022 34.Dt TEE 1 35.Os 36.Sh NAME 37.Nm tee 38.Nd duplicate standard input 39.Sh SYNOPSIS 40.Nm 41.Op Fl ai 42.Op Ar 43.Sh DESCRIPTION 44The 45.Nm 46utility copies standard input to standard output, 47making a copy in zero or more files. 48The output is unbuffered. 49.Pp 50The following options are available: 51.Bl -tag -width indent 52.It Fl a 53Append the output to the files rather than 54overwriting them. 55.It Fl i 56Ignore the 57.Dv SIGINT 58signal. 59.El 60.Pp 61The following operands are available: 62.Bl -tag -width indent 63.It Ar file 64A pathname of an output 65.Ar file . 66.El 67.Pp 68The 69.Nm 70utility takes the default action for all signals, 71except in the event of the 72.Fl i 73option. 74.Sh EXIT STATUS 75.Ex -std 76.Sh EXAMPLES 77Send the echoed message both to stdout and to the 78.Pa greetings.txt 79file: 80.Bd -literal -offset indent 81$ echo "Hello" | tee greetings.txt 82Hello 83.Ed 84.Sh STANDARDS 85The 86.Nm 87utility is expected to be 88.St -p1003.2 89compatible. 90.Sh HISTORY 91The 92.Nm 93command first appeared in 94.At v7 . 95