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nvram.8
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nvram.c
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.\"- .\" Copyright (c) 2006 Maxim Sobolev <sobomax@FreeBSD.org> .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE .\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, .\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES .\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR .\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN .\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE .\" POSSIBILITY OF SUCH DAMAGE. .\" .\" $FreeBSD$ .\" .Dd June 19, 2020 .Dt NVRAM 8 powerpc .Os .Sh NAME .Nm nvram .Nd "display or modify contents of the EEPROM or NVRAM" .Sh SYNOPSIS .Nm .Fl p .Nm .Oo Fl d Ar name Oc Ar ... .Op Ar name Ns = Ns Ar value ... .Sh DESCRIPTION The .Nm utility provides an interface for displaying and changing the system's configuration variables contained in EEPROM or NVRAM. In the first synopsis form, all available configuration variables and their current values are printed. In the second form, the variable selected by .Ar name is either removed or its value is changed to the .Ar value following by .Ql = sign. .Pp The following options are available: .Bl -tag -width indent .It Fl d Ar name Delete the variable selected by .Ar name from the EEPROM or NVRAM. The .Fl d flag can be specified multiple times, in which case multiple variables will be removed. .It Fl p Print all available configuration variables and their current values. .El .Sh EXAMPLES Print all available configuration variables and their current values: .Pp .Dl "nvram -p" .Pp Remove the variable named .Va local-mac-address? : .Pp .Dl "nvram -d local-mac-address\e?" .Pp Set the value of the .Va local-mac-address? variable to .Dq Li true : .Pp .Dl "nvram local-mac-address\e?=true" .Pp Note that the .Ql \e in the above examples is used to keep the shell from interpreting the .Ql \&? . .Pp Remove variables named .Va foo and .Va bar and set variable named .Va baz to .Dq Li 100 : .Pp .Dl "nvram -d foo -d bar baz=100" .Sh SEE ALSO .Xr powermac_nvram 4 .Sh HISTORY The .Nm utility first appeared in .Fx 7.0 . It is inspired by the Darwin/Mac OS X .Nm utility. .Sh AUTHORS .An Maxim Sobolev Aq Mt sobomax@FreeBSD.org
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