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.Dd October 30, 2022 32.Dt TEE 1 33.Os 34.Sh NAME 35.Nm tee 36.Nd duplicate standard input 37.Sh SYNOPSIS 38.Nm 39.Op Fl ai 40.Op Ar 41.Sh DESCRIPTION 42The 43.Nm 44utility copies standard input to standard output, 45making a copy in zero or more files. 46The output is unbuffered. 47.Pp 48The following options are available: 49.Bl -tag -width indent 50.It Fl a 51Append the output to the files rather than 52overwriting them. 53.It Fl i 54Ignore the 55.Dv SIGINT 56signal. 57.El 58.Pp 59The following operands are available: 60.Bl -tag -width indent 61.It Ar file 62A pathname of an output 63.Ar file . 64.El 65.Pp 66The 67.Nm 68utility takes the default action for all signals, 69except in the event of the 70.Fl i 71option. 72.Sh EXIT STATUS 73.Ex -std 74.Sh EXAMPLES 75Send the echoed message both to stdout and to the 76.Pa greetings.txt 77file: 78.Bd -literal -offset indent 79$ echo "Hello" | tee greetings.txt 80Hello 81.Ed 82.Sh STANDARDS 83The 84.Nm 85utility is expected to be 86.St -p1003.2 87compatible. 88.Sh HISTORY 89The 90.Nm 91command first appeared in 92.At v7 . 93