freebsd-dev/bin/kenv/kenv.1
Benjamin Kaduk f3aff7c91b Fix mandoc -Tlint warnings in bin/
Many style-level issues are still reported.

Submitted by:	Yuri Pankov <yuripv@gmx.com>
Reviewed by:	jilles (previous revision)
Differential Revision:	https://reviews.freebsd.org/D13334
2017-12-07 01:57:27 +00:00

115 lines
3.1 KiB
Groff

.\"-
.\" Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
.\"
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.\" modification, are permitted provided that the following conditions
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.\" $FreeBSD$
.\"
.Dd May 11, 2012
.Dt KENV 1
.Os
.Sh NAME
.Nm kenv
.Nd dump or modify the kernel environment
.Sh SYNOPSIS
.Nm
.Op Fl hNq
.Nm
.Op Fl qv
.Ar variable Ns Op = Ns Ar value
.Nm
.Op Fl q
.Fl u
.Ar variable
.Sh DESCRIPTION
The
.Nm
utility will dump the kernel environment if
invoked without arguments.
If the
.Fl h
option is specified, it will limit the report to kernel probe hints.
If an optional
.Ar variable
name is specified,
.Nm
will only report that value.
If the
.Fl N
option is specified,
.Nm
will only display variable names and not their values.
If the
.Fl u
option is specified,
.Nm
will delete the given environment variable.
If the environment variable is followed by an optional
.Ar value ,
.Nm
will set the environment variable to this value.
.Pp
If the
.Fl q
option is set, warnings normally printed as a result of being unable to
perform the requested operation will be suppressed.
.Pp
If the
.Fl v
option is set, the variable name will be printed out for the
environment variable in addition to the value when
.Nm
is executed with a variable name.
.Pp
Variables can be added to the kernel environment using the
.Pa /boot/loader.conf
file, or also statically compiled into the kernel using the statement
.Pp
.Dl Ic env Ar filename
.Pp
in the kernel config file.
The file can contain lines of the form
.Pp
.Dl name = "value" # this is a comment
.Pp
where whitespace around
.Sq name
and
.Sq = ,
and everything after a
.Sq #
character, are ignored.
Almost any printable character except
.Sq =
is acceptable as part of a name.
Quotes are optional and necessary only if the value contains whitespace.
.Sh SEE ALSO
.Xr kenv 2 ,
.Xr config 5 ,
.Xr loader.conf 5 ,
.Xr loader 8
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 4.1.1 .