1.\" 2.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd April 24, 2016 29.Dt JEXEC 8 30.Os 31.Sh NAME 32.Nm jexec 33.Nd "execute a command inside an existing jail" 34.Sh SYNOPSIS 35.Nm 36.Op Fl l 37.Op Fl u Ar username | Fl U Ar username 38.Ar jail Op Ar command ... 39.Sh DESCRIPTION 40The 41.Nm 42utility executes 43.Ar command 44inside the 45.Ar jail 46identified by its jid or name. 47If 48.Ar command 49is not specified then the user's shell is used. 50.Pp 51The following options are available: 52.Bl -tag -width indent 53.It Fl l 54Execute in a clean environment. 55The environment is discarded except for 56.Ev HOME , SHELL , TERM , USER , 57and anything from the login class capability database for the user. 58.It Fl u Ar username 59The user name from host environment as whom the 60.Ar command 61should run. 62This is the default. 63.It Fl U Ar username 64The user name from jailed environment as whom the 65.Ar command 66should run. 67.El 68.Sh SEE ALSO 69.Xr jail_attach 2 , 70.Xr jail 8 , 71.Xr jls 8 72.Sh HISTORY 73The 74.Nm 75utility was added in 76.Fx 5.1 . 77.Sh BUGS 78If the jail is not identified by 79.Ar jid 80there is a possible race in between the lookup of the jail 81and executing the command inside the jail. 82Giving a 83.Ar jid 84has a similar race as another process can stop the jail and 85start another one after the user looked up the 86.Ar jid . 87