1.\" $NetBSD: env.1,v 1.16 2024/10/28 11:30:37 kim Exp $ 2.\" 3.\" Copyright (c) 1980, 1990 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Institute of Electrical and Electronics Engineers, Inc. 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)printenv.1 6.7 (Berkeley) 7/28/91 33.\" $NetBSD: env.1,v 1.16 2024/10/28 11:30:37 kim Exp $ 34.\" 35.Dd October 28, 2024 36.Dt ENV 1 37.Os 38.Sh NAME 39.Nm env 40.Nd set and print environment 41.Sh SYNOPSIS 42.Nm 43.Op Fl 0i 44.Op Fl C Ar dir 45.Op Fl u Ar name 46.Op Ar name=value ... 47.Oo 48.Ar utility 49.Op argument ... 50.Oc 51.Sh DESCRIPTION 52.Nm 53executes 54.Ar utility 55after modifying the environment as 56specified on the command line. 57Each 58.Ar name=value 59option specifies 60an environmental variable, 61.Ar name , 62with a value of 63.Ar value . 64The 65.Sq Fl i 66option causes 67.Nm 68to completely ignore the environment 69it inherits. 70.Pp 71The 72.Sq Fl C Ar dir 73option causes the working directory to be changed to 74.Ar dir . 75.Pp 76The 77.Sq Fl u Ar name 78option causes removal of the 79.Ar name 80environment variable if it is in the environment. 81This is similar to the 82.Ic unset 83command in 84.Xr sh 1 . 85The value for 86.Ar name 87must not include the 88.Ql = 89character. 90.Pp 91If no 92.Ar utility 93is specified, 94.Nm 95prints out the names and values of the variables in the environment. 96Each 97.Ar name=value 98pair is separated by a new line unless 99.Fl 0 100is specified, in which case name/value pairs are separated by NUL. 101The 102.Fl 0 103option and 104.Ar utility 105must not be specified together. 106.Sh EXIT STATUS 107.Nm 108exits with one of the following values: 109.Bl -tag -width Ds 110.It 0 111.Ar utility 112was invoked and completed successfully. 113In this case the exit code is returned by the utility itself, not 114.Nm . 115If no utility was specified, then 116.Nm 117completed successfully and returned the exit code itself. 118.It 1 119An invalid command line option was passed to 120.Nm . 121.It 1\-125 122.Ar utility 123was invoked, but failed in some way; 124see its manual page for more information. 125In this case the exit code is returned by the utility itself, not 126.Nm . 127.It 125 128.Ar utility 129was specified together with the 130.Fl 0 131option. 132.It 126 133.Ar utility 134was found, but could not be invoked. 135.It 127 136.Ar utility 137could not be found. 138.El 139.Sh COMPATIBILITY 140The historic 141.Fl 142option has been deprecated but is still supported in this implementation. 143.Pp 144The 145.Fl C , u 146and 147.Fl 0 148options are non-standard extensions. 149.Sh SEE ALSO 150.Xr chdir 2 , 151.Xr execvp 3 , 152.Xr environ 7 153.Sh STANDARDS 154The 155.Nm 156utility conforms to 157.St -p1003.2-92 . 158.Sh HISTORY 159The 160.Nm 161command appeared in 162.Bx 4.4 . 163.Pp 164The 165.Fl u 166and 167.Fl 0 168options first appeared in 169.Nx 10 . 170.Pp 171The 172.Fl C 173option first appeared in 174.Nx 10.1 . 175.Sh BUGS 176.Nm 177doesn't handle commands with equal 178.Pq Dq = 179signs in their 180names, for obvious reasons. 181