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-.Dd March 6, 2019
+.Dd June 18, 2020
 .Dt EFIVAR 8
 .Os
 .Sh NAME
 .Nm efivar
 .Nd UEFI environment variable interaction
 .Sh SYNOPSIS
 .Nm
 .Op Fl abdDHlLNpRtuw
 .Op Fl n Ar name
 .Op Fl f Ar file
 .Op Fl -append
 .Op Fl -ascii
 .Op Fl -attributes
 .Op Fl -binary
 .Op Fl -delete
 .Op Fl -device-path
 .Op Fl -fromfile Ar file
 .Op Fl -guid
 .Op Fl -hex
 .Op Fl -list-guids
 .Op Fl -list
 .Op Fl -load-option
 .Op Fl -name Ar name
 .Op Fl -no-name
 .Op Fl -print
 .Op Fl -print-decimal
 .Op Fl -raw-guid
 .Op Fl -utf8
 .Op Fl -write
 .Sh DESCRIPTION
 This program manages
 .Dq Unified Extensible Firmware Interface
 .Pq UEFI
 environment variables.
 UEFI variables have three part: A namespace, a name and a value.
 The namespace is a GUID that is self assigned by the group defining the
 variables.
 The name is a Unicode name for the variable.
 The value is binary data.
 All Unicode data is presented to the user as UTF-8.
 .Pp
 The following options are available:
 .Bl -tag -width 20m
 .It Fl n Ar name Fl -name Ar name
 Specify the name of the variable to operate on.
 The
 .Ar name
 argument is the GUID of the variable, followed by a dash, followed by the
 UEFI variable name.
 The GUID may be in numeric format, or may be one of the well known
 symbolic name (see
 .Fl -list-guids
 for a complete list).
 .It Fl f Ar file Fl -fromfile Ar file
 When writing or appending to a variable, take the data for the
 variable's value from
 .Ar file
 instead of from the command line.
 This flag implies
 .Fl -write
 unless the
 .Fl -append
 or
 .Fl -print
 flags are given.
 This behavior is not well understood and is currently unimplemented
 for writes.
 When
 .Fl -print
 is specified, the contents of the file are used as the value to
 print using any other specified flags.
 This is used primarily for testing purposes for more complicated
 variable decoding.
 .It Fl a Fl -append
 Append the specified value to the UEFI variable rather than replacing
 it.
 .It Fl t Ar attr Fl -attributes Ar attr
 Specify, in hexadecimal, the attributes for this
 variable.
 See section 7.2 (GetVariable subsection, Related Definitions) of the
 UEFI Specification for hex values to use.
 .It Fl A Fl -ascii
 Display the variable data as modified ascii: All printable characters
 are printed, while unprintable characters are rendered as a two-digit
 hexadecimal number preceded by a % character.
 .It Fl b Fl -binary
 Display the variable data as binary data.
 Usually will be used with the
 .Fl N
 or
 .Fl -no-name
 flag.
 Useful in scripts.
 .It Fl D Fl -delete
 Delete the specified variable.
 May not be used with either the
 .Fl -write
 or the
 .Fl -append
 flags.
 No
 .Ar value
 may be specified.
 .It Fl d Fl -device Fl -device-path
 Interpret the variables printed as UEFI device paths and print the
 UEFI standard string representation.
 .It Fl g Fl -guid
-flag is specified, guids are converted to names if they are known (and
-show up in
-.Fl -list-guids ).
+Convert GUIDs to names if they are known
+.Po and show them up in
+.Fl -list-guids
+.Pc .
 .It Fl H Fl -hex
 List variable data as a hex dump.
 .It Fl L Fl -list-guids
 Lists the well known GUIDs.
 The names listed here may be used in place of the numeric GUID values.
 These names will replace the numeric GUID values unless
 .Fl -raw-guid
 flag is specified.
 .It Fl l Fl -list
 List all the variables.
 If the
 .Fl -print
 flag is also listed, their values will be displayed.
 .It Fl -load-option
 Decode the variable as if it were a UEFI Boot Option, including information about what device and/or paths the UEFI DevicePaths decode to.
 .It Fl N Fl -no-name
 Do not display the variable name.
 .It Fl p Fl -print
 Print the value of the variable.
 .It Fl R Fl -raw-guid
 Do not substitute well known names for GUID numeric values in output.
 .It Fl u Fl -utf8
 Treat the value of the variable as UCS2 and convert it to UTF8 and
 print the result.
 .It Fl w Fl -write
 Write (replace) the variable specified with the value specified from
 standard input.
 No command line option to do this is available since UEFI variables
 are binary structures rather than strings.
 .Xr echo 1
 .Fl n
 can be used to specify simple strings.
 .It Ar name
 Display the
 .Ar name
 environment variable.
 .El
 .Sh COMPATIBILITY
 The
 .Nm
 program is intended to be compatible (strict superset) with a program
 of the same name included in the Red Hat libefivar package,
 but the
 .Fl d
 and
 .Fl -print-decimal
 flags are not implemented and never will be.
 .Pp
 The
 .Fl d
 flag is short for
 .Fl -device-path .
 .Sh SEE ALSO
 Appendix A of the UEFI specification has the format for GUIDs.
 All GUIDs
 .Dq Globally Unique Identifiers
 have the format described in RFC 4122.
 .Sh HISTORY
 The
 .Nm
 utility first appeared in
 .Fx 11.1 .