1.\" 2.\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for 3.\" permission to reproduce portions of its copyrighted documentation. 4.\" Original documentation from The Open Group can be obtained online at 5.\" http://www.opengroup.org/bookstore/. 6.\" 7.\" The Institute of Electrical and Electronics Engineers and The Open 8.\" Group, have given us permission to reprint portions of their 9.\" documentation. 10.\" 11.\" In the following statement, the phrase ``this text'' refers to portions 12.\" of the system documentation. 13.\" 14.\" Portions of this text are reprinted and reproduced in electronic form 15.\" in the SunOS Reference Manual, from IEEE Std 1003.1, 2004 Edition, 16.\" Standard for Information Technology -- Portable Operating System 17.\" Interface (POSIX), The Open Group Base Specifications Issue 6, 18.\" Copyright (C) 2001-2004 by the Institute of Electrical and Electronics 19.\" Engineers, Inc and The Open Group. In the event of any discrepancy 20.\" between these versions and the original IEEE and The Open Group 21.\" Standard, the original IEEE and The Open Group Standard is the referee 22.\" document. The original Standard can be obtained online at 23.\" http://www.opengroup.org/unix/online.html. 24.\" 25.\" This notice shall appear on any product containing this material. 26.\" 27.\" The contents of this file are subject to the terms of the 28.\" Common Development and Distribution License (the "License"). 29.\" You may not use this file except in compliance with the License. 30.\" 31.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 32.\" or http://www.opensolaris.org/os/licensing. 33.\" See the License for the specific language governing permissions 34.\" and limitations under the License. 35.\" 36.\" When distributing Covered Code, include this CDDL HEADER in each 37.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. 38.\" If applicable, add the following below this CDDL HEADER, with the 39.\" fields enclosed by brackets "[]" replaced with your own identifying 40.\" information: Portions Copyright [yyyy] [name of copyright owner] 41.\" 42.\" 43.\" Copyright 1989 AT&T 44.\" Portions Copyright (c) 1992, X/Open Company Limited All Rights Reserved 45.\" Copyright (c) 1995, Sun Microsystems, Inc. All Rights Reserved. 46.\" Copyright 2024 Oxide Computer Company 47.\" 48.Dd September 19, 2024 49.Dt TRUE 1 50.Os 51.Sh NAME 52.Nm true , 53.Nm false 54.Nd provide truth values 55.Sh SYNOPSIS 56.Nm true 57.Nm false 58.Sh DESCRIPTION 59The 60.Nm true 61utility does nothing, successfully. 62The 63.Nm false 64utility does nothing, unsuccessfully. 65They are typically used in a shell script as: 66.Bd -literal -offset indent 67while true; do 68 command 69done 70.Ed 71.Pp 72which executes 73.Sq command 74forever. 75.Sh EXIT STATUS 76.Nm true 77has exit status 78.Sy 0 . 79.Pp 80.Nm false 81will always exit with a non-zero value between 1 and 125, inclusive. 82.Sh INTERFACE STABILITY 83.Nm true 84and 85.Nm false 86are 87.Sy Committed . 88.Sh SEE ALSO 89.Xr sh 1 , 90.Xr attributes 7 91