exiv2/man/man1/exiv2.1

.\"                                      Hey, EMACS: -*- nroff -*-
.\" First parameter, NAME, should be all caps
.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
.\" other parameters are allowed: see man(7), man(1)
.TH EXIV2 1 "May 22, 2019"
.\" Please adjust this date whenever revising the manpage.
.\"
.\" Some roff macros, for reference:
.\" .nh        disable hyphenation
.\" .hy        enable hyphenation
.\" .ad l      left justify
.\" .ad b      justify to both left and right margins
.\" .nf        disable filling
.\" .fi        enable filling
.\" .br        insert line break
.\" .sp <n>    insert n+1 empty lines
.\" for manpage-specific macros, see man(7)
.SH NAME
exiv2 \- Image metadata manipulation tool
.SH SYNOPSIS
.B exiv2
[\fIoptions\fP] [\fIaction\fP] \fIfile\fP ...
.br
.SH DESCRIPTION
.PP
.\" TeX users may be more comfortable with the \fB<whatever>\fP and
.\" \fI<whatever>\fP escape sequences to invode bold face and italics,
.\" respectively.
.B exiv2
is a program to read and write Exif, IPTC, XMP metadata and
image comments and can read many vendor makernote tags. The program
optionally converts between Exif tags, XMP properties and IPTC
datasets as recommended by the Exif Standard, the IPTC Standard,
the XMP specification and Metadata Working Group guidelines.
.br
The following image formats are supported:
.TS
lB lB lB lB lB lB
_	_	_	_	_	_
l l l l l l.
Type	Exif	IPTC	XMP	Image Comments	ICC Profile
JPEG	Read/Write	Read/Write	Read/Write	Read/Write	Read/Write
EXV	Read/Write	Read/Write	Read/Write	Read/Write Read/Write
CR2	Read/Write	Read/Write	Read/Write	-	Read/Write
CRW	Read/Write	-	-	Read/Write	-
MRW	Read	Read	Read	-	-
TIFF	Read/Write	Read/Write	Read/Write	-	Read/Write
WEBP	Read/Write	-	Read/Write	-	Read/Write
DNG	Read/Write	Read/Write	Read/Write	-	Read/Write
NEF	Read/Write	Read/Write	Read/Write	-	Read/Write
PEF	Read/Write	Read/Write	Read/Write	-	Read/Write
ARW	Read	Read	Read	-	-
RW2	Read	Read	Read	-	-
SR2	Read	Read	Read	-	-
SRW	Read/Write	Read/Write	Read/Write	-	-
ORF	Read/Write	Read/Write	Read/Write	-	-
PNG	Read/Write	Read/Write	Read/Write	Read/Write	Read/Write
PGF	Read/Write	Read/Write	Read/Write	Read/Write	Read/Write
RAF	Read	Read	Read	-	-
EPS	-	-	Read/Write	-	-
XMP	-	-	Read/Write	-	-
GIF	-	-	-	-	-
PSD	Read/Write	Read/Write	Read/Write	-	-
TGA	-	-	-	-	-
BMP	-	-	-	-	-
JP2	Read/Write	Read/Write	Read/Write	-	Read/Write
.TE
.IP \(bu 2
Support for GIF, TGA and BMP images is minimal: the image format is
recognized, a MIME type assigned to it and the height and width of the
image are determined.
.IP \(bu 2
Reading other TIFF-like RAW image formats, which are not listed in the
table, may also work.
.SH ACTIONS
The \fIaction\fP argument is only required if it is not clear from the
\fIoptions\fP which action is implied.
.TP
.B pr | print
Print image metadata. This is the default action, i.e., the command
\fIexiv2 image.jpg\fP will print a summary of the image Exif metadata.
.TP
.B ex | extract
Extract metadata to *.exv, XMP sidecar (*.xmp) and thumbnail image files.
Modification commands can be applied on-the-fly.
.TP
.B in | insert
Insert metadata from corresponding *.exv, XMP sidecar (*.xmp) and
thumbnail files.  Use option \fB\-S\fP \fI.suf\fP to change the suffix
of the input files. Since files of any supported format can be used as
input files, this command can be used to copy the metadata between
files of different formats. Modification commands can be applied
on-the-fly.
.TP
.B rm | delete
Delete image metadata from the files.
.TP
.B ad | adjust
Adjust Exif timestamps by the given time. Requires at least one of the
options \fB\-a\fP \fItime\fP, \fB\-Y\fP \fIyrs\fP, \fB\-O\fP
\fImon\fP or \fB\-D\fP \fIday\fP.
.TP
.B mo | modify
Apply commands to modify (add, set, delete) the Exif, IPTC and XMP
metadata of image files. Requires option \fB\-c\fP, \fB\-m\fP or
\fB\-M\fP.
.TP
.B mv | rename
Rename files and/or set file timestamps according to the Exif create
timestamp. Uses the value of tag Exif.Photo.DateTimeOriginal or, if
not present, Exif.Image.DateTime to determine the timestamp. The
filename format can be set with \fB\-r\fP \fIfmt\fP, timestamp options
are \fB\-t\fP and \fB\-T\fP.
.TP
.B fi | fixiso
Copy the ISO setting from one of the proprietary Nikon or Canon
makernote ISO tags to the regular Exif ISO tag,
Exif.Photo.ISOSpeedRatings. Does not overwrite an existing standard
Exif ISO tag.
.TP
.B fc | fixcom
Fix the character encoding of Exif Unicode user comments.  Decodes the
comment using the auto-detected or specified character encoding and
writes it back in UCS-2. Use option \fB\-n\fP to specify the current
encoding of the comment if necessary.
.br
.ne 40
.SH COMMAND SUMMARY
.sp 1
.nf
exiv2 [ opt [arg] ]+ [ act ] file ...
.sp 1
option [arg]	long option	description
-a	tim	--adjust	Modify time stamps.  [+|-]HH[:MM[:SS[.mmm]]]
-b		--binary	Show large binary values (default is to suppress them).
-c	txt	--comment	JPEG comment string to set in the image ('modify' action).  ...
-d	tgt	--delete	Delete target(s) for the 'delete' action. ...
-D	+-n	--days	Time  adjustment by a positive or negative number of days ...
-e	tgt	--extract	Extract target(s) for the 'extract' action.
-f		--force	Do not prompt before overwriting existing  files ...
-F		--Force	Do not prompt before renaming files (Force rename) ...
-g	key	--grep	Only output info for this Exiv2 key
-h		--help	Display help and exit.
-i	tgt	--insert	Insert target(s) for the 'insert' action. ...
-k		--keep	Preserve file timestamps when updating files
-K	key	--key	Report key.  Similar to -g (grep) however key must match exactly.
-l	dir	--location	Location (directory) for files to be inserted or extracted.
-m	file	--modify	read commands from cmd-file
-M	cmd	--Modify	Command line for the 'modify' action. ...
-n	enc	--encode	Charset to decode Exif Unicode user comments. See: man 3 iconv_open
-O	+-n	--months	Time adjustment by a positive or negative number of months, ...
-p	mod	--print	Print report (common reports)
-P	flg	--Print	Print report (fine grained control)
-q		--quiet	Silence warnings and error messages from the Exiv2 library ...
-Q	lvl	--log	Set the log-level to 'd'(ebug), 'i'(nfo), 'w'(arning), 'e'(rror)
-r	fmt	--rename	Filename format for the 'rename' action. ...
-S	suf	--suffix	Use suffix .suf for source files for insert command.
-t		--timestamp	Set the file timestamp according to the Exif create timestamp ...
-T		--Timestamp	Only set the file timestamp according to Exif create timestamp ...
-u		--unknown	Show unknown tags ...
-v		--verbose	verbose
-V		--version	Show the program version and exit.
-Y	+-n	--years	Time adjustment by a positive or negative number of years ...
.sp 1
act		pr | ex | in | rm | ad | mo | mv | fi | fc
		print, extract, insert, delete, adjust, modify, rename, fixiso, fixcom

cmd		See "Commands" below.

flg		E | I | X | x | g | k | l | n | y | c | s | v | t | h
		Exif, IPTC, XMP, num, grp, key, label, name, type, count, size, vanilla, translated, hex

fmt		Default format is %Y%m%d_%H%M%S.

lvl		d | i | i | w | e
		debug, info, warning, error

mod		s | a | e | t | v | h | i | x | c | p | i | C | R | S | X
		summary, all, exif, translated, vanilla, hex, iptc, xmp, comment, preview,
		ICC Profile, Recursive Structure, Simple Structure, raw XMP

tgt		a | c | e | i | p | t | x | C | X | XX | -
		all, comment, exif, iptc, preview, thumb, xmp, ICC Profile, SideCar, RawXMP, stdin/out

.br
.fi
.ne 40
.SH OPTIONS
.TP
.B \-h
Display help and exit.
.TP
.B \-V
Show the program version and exit.
.br
When \fB\-V\fP is combined with \fB\-v\fP (Verbose version), build information
is printed to standard output along with a list of shared libraries which
have been loaded into memory. Verbose version is supported on Windows
(MSVC, Cygwin and MinGW builds), MacOSX and Linux and is provided
for test and debugging.
.TP
.B \-v
Be verbose during the program run.
.TP
.B \-q
Silence warnings and error messages from the Exiv2 library during the
program run (quiet). Note that options \fB\-v\fP and \fB\-q\fP can be
used at the same time.
.TP
.B \-Q \fIlvl\fP
Set the log-level to 'd'(ebug), 'i'(nfo), 'w'(arning), 'e'(rror)
or 'm'(ute). The default log-level is 'w'. \fB\-Qm\fP is equivalent
to \fB\-q\fP. All log messages are written to standard error.
.TP
.B \-b
Show large binary values (default is to suppress them).
.TP
.B \-u
Show unknown tags (default is to suppress tags which don't have a name).
.TP
.B \-g \fIkey\fP
Only keys which match the given key (grep).
.br
Multiple \fB\-g\fP options
can be used to filter info to less keys. Example:
exiv2 -v -V -g webready -g time.
The default exiv2 command prints a "summary report" which is quite short.  When you use -g without a -pmod option, you do not get a summary report and in effect you get -g pattern -pa image ...

.nf
$ bin/exiv2 -g Date http://clanmills.com/Stonehenge.jpg
Exif.Image.DateTime                 Ascii    20  2015:07:16 20:25:28
Exif.Photo.DateTimeOriginal         Ascii    20  2015:07:16 15:38:54
Exif.Photo.DateTimeDigitized        Ascii    20  2015:07:16 15:38:54
Exif.NikonWt.DateDisplayFormat      Byte      1  Y/M/D
Exif.GPSInfo.GPSDateStamp           Ascii    11  2015:07:16
Xmp.xmp.ModifyDate                  XmpText  25  2015-07-16T20:25:28+01:00

.fi
You may use -pmod filters to further filter output.  For example:
.nf

$ bin/exiv2 -px -g Date http://clanmills.com/Stonehenge.jpg
Xmp.xmp.ModifyDate                           XmpText    25  2015-07-16T20:25:28+01:00

.fi
The option -g (--grep) applies to keys and not values.

The key may finish with the optional modifier /i to indicate case insensitive.
.TP
.B \-K \fIkey\fP
Only report data for given key.
.br
Multiple \fB\-K\fP options can be used to report more than a single key.

.nf
exiv2 \-K Exif.Photo.DateTimeDigitized -K Exif.Photo.DateTimeOriginal \-pt R.jpg
Exif.Photo.DateTimeOriginal   Ascii    20  2011:09:18 16:25:48
Exif.Photo.DateTimeDigitized  Ascii    20  2011:09:18 16:25:48
.fi
.TP
.B \-n \fIenc\fP
Charset to use to decode Exif Unicode user comments. \fIenc\fP is
a name understood by \fBiconv_open\fP(3), e.g., 'UTF-8'.
.TP
.B \-k
Preserve file timestamps when updating files (keep). Can be used with
all options which update files. The flag is ignored by read-only
options.
.TP
.B \-t
Set the file timestamp according to the Exif create timestamp in
addition to renaming the file (overrides \fB\-k\fP). This option is
only used with the 'rename' action.
.TP
.B \-T
Only set the file timestamp according to the Exif create timestamp, do
not rename the file (overrides \fB\-k\fP). This option is only used
with the 'rename' action. Note: On Windows you may have to set the TZ
environment variable for this option to work correctly.
.TP
.B \-f,\-F
These options are used by the commands 'rename' and 'extract' to
determine the file overwrite policy.  These options are usually
combined with -v/--verbose to provide additional status output.
.br
.sp 1
The options --force and --Force apply to the 'rename' command.
The 'extract' command treats --force and --Force as permission to
overwrite.
.br
.sp 1
The default behaviour is to prompt the user.
.br
-f = Do not prompt before overwriting existing files.
.br
-F = Do not prompt before renaming files. Appends '_1'
('_2', ...) to the name of the new file.  For example:
.sp 1
.nf
$ curl --silent -O http://clanmills.com/Stonehenge.jpg
$ exiv2 --verbose --Force rename Stonehenge.jpg
File 1/1: Stonehenge.jpg
Renaming file to ./20150716_153854.jpg
$ curl --silent -O http://clanmills.com/Stonehenge.jpg
$ exiv2 --verbose --Force rename Stonehenge.jpg
File 1/1: Stonehenge.jpg
Renaming file to ./20150716_153854_1.jpg
.sp 1
.fi
The 'rename' command will only overwrite files when the option --force is used.  The option --Force is provided to avoid unintentional loss of valuable image files.
.sp 1
The 'extract' command will overwrite files when either --force or --Force is used.  Overwriting extracted files will not cause the loss of image files.
.br
.TP
.B \-r \fIfmt\fP
Filename format for the 'rename' action. The format string follows
\fBstrftime\fP(3) and supports the following keywords:
.TS
l l.
:basename:	original filename without extension
:dirname:	name of the directory holding the original file
:parentname:	name of parent directory
.TE
Default filename format is %Y%m%d_%H%M%S.
.TP
.B \-a \fItime\fP
Time adjustment in the format [\-]HH[:MM[:SS]]. This option is only
used with the 'adjust' action. Examples: 1 adds one hour, 1:01
adds one hour and one minute, \-0:00:30 subtracts 30 seconds.
.TP
.B \-Y \fIyrs\fP
Time adjustment by a positive or negative number of years, for
the 'adjust' action.
.TP
.B \-O \fImon\fP
Time adjustment by a positive or negative number of months, for
the 'adjust' action.
.TP
.B \-D \fIday\fP
Time adjustment by a positive or negative number of days, for
the 'adjust' action.
.TP
.B \-p \fImode\fP
Print mode for the 'print' action. Possible modes are:
.TS
l l.
s : print a summary of the Exif metadata (the default)
a : print Exif, IPTC and XMP metadata (shortcut for \-Pkyct)
e : print Exif metadata (shortcut for \-PEkycv)
t : interpreted (translated) Exif tags (\-PEkyct)
v : plain Exif tag values (\-PExgnycv)
h : hexdump of the Exif data (\-PExgnycsh)
i : IPTC datasets (\-PIkyct)
x : XMP properties (\-PXkyct)
c : JPEG comment
p : list available image previews, sorted by preview image size in pixels
C : print image ICC Profile (jpg, png, tiff, webp, cr2, jp2 only)
R : print image structure recursively (jpg, png, tiff, webp, cr2, jp2 only)
S : print image structure information (jpg, png, tiff, webp, cr2, jp2 only)
X : print "raw" XMP (jpg, png, tiff, webp, cr2, jp2 only)
.TE
.TP
.B \-P \fIflgs\fP
Print flags for fine control of the tag list ('print' action). Allows
control of the type of metadata as well as data columns included in
the print output.  Valid flags are:
.TS
l l.
E : include Exif tags in the list
I : IPTC datasets
X : XMP properties
x : print a column with the tag number
g : group name
k : key
l : tag label
n : tag name
y : type
c : number of components (count)
s : size in bytes
v : plain data value (vanilla values)
V : plain data value AND the word 'set ' (for use with exiv2 -m-)
t : interpreted (translated) human readable data
h : hexdump of the data
.TE
.TP
.B \-d \fItgt\fP
Delete target(s) for the 'delete' action. Possible targets are:
.TS
l l.
a : all supported metadata (the default)
e : Exif section
t : Exif thumbnail only
i : IPTC data
x : XMP packet
c : JPEG comment
C : ICC Profile
I : All IPTC data
.TE
.TP
.B \-i \fItgt\fP
Insert target(s) for the 'insert' action. Possible targets are the
same as those for the \fB\-d\fP option, plus an optional modifier:
.sp 1
X : Insert metadata from an XMP sidecar file <file>.xmp. The remaining
insert targets determine what metadata to insert from the sidecar
file. Possible are Exif, IPTC and XMP and the default is all of
these. Note that the inserted XMP properties include those converted
to Exif and IPTC.
.sp 1
XX: Insert "raw" XMP metadata from a sidecar (see option -pX)
.sp 1
- : Read from stdin.  This option is intended for "filter" operations such as:
.br
$ exiv2 -e{tgt}- \fIfilename\fP | xmllint .... | exiv2 -i{tgt}- \fIfilename\fP
.sp 1
Only JPEG thumbnails can be inserted (not TIFF thumbnails), and must be named \fIfile\fP\-thumb.jpg.
.TP
.B \-e \fItgt\fP
Extract target(s) for the 'extract' action. Possible targets are the same
as those for the \fB\-d\fP option, plus a target to extract preview
images and a modifier to generate an XMP sidecar file:
.br
p[<n>[,<m> ...]] : Extract preview images. The optional comma separated
list of preview image numbers is used to determine which preview images
to extract. The available preview images and their numbers are displayed
with the 'print' option \fB\-pp\fP.
.sp 1
C : Extract embedded ICC profile to <file>.icc
.sp 1
X : Extract metadata to an XMP sidecar file <file>.xmp. The remaining
extract targets determine what metadata to extract to the sidecar
file. Possible are Exif, IPTC and XMP and the default is all of these.
.sp
XX: Extract "raw" XMP metadata to a sidecar (see -pX)
.br
    You may not use modify commands with the -eXX option and only XMP is written to the sidecar.
.sp 1
- : Output to stdout (see -i tgt for an example of this feature)
.sp 1
.TP
.B \-c \fItxt\fP
JPEG comment string to set in the image ('modify' action). This option
can also be used with the 'extract' and 'insert' actions to modify
metadata on-the-fly.
.TP
.B \-m \fIfile\fP
Command file for the 'modify' action. This option can also be used
with the 'extract' and 'insert' actions to modify metadata on-the-fly.
-m- represents standard-input.
.TP
.B \-M \fIcmd\fP
Command line for the 'modify' action. This option can also be used
with the 'extract' and 'insert' actions to modify metadata on-the-fly.
The format for the commands is the same as that of the lines of a
command file.
.TP
.B \-l \fIdir\fP
Location (directory) for files to be inserted or extracted.
.TP
.B \-S \fI.suf\fP
Use suffix \fI.suf\fP for source files in 'insert' action.
.br
.ne 40
.SH COMMANDS
Commands for the 'modify' action can be read from a command file, e.g.,
.sp 1
.nf
   exiv2 \-m cmd.txt image.jpg
.fi
.sp 1
or given on the command line, as in
.sp 1
.nf
   exiv2 \-M"add Iptc.Application2.Credit String Mr. Smith" image.jpg
.fi
.sp 1
Note the quotes. Multiple \fB\-m\fP and \fB\-M\fP options can be combined,
and a non-standard XMP namespace registered.
.sp 1
.nf
   exiv2 \-M"reg myprefix http://ns.myprefix.me/" \-M"add Xmp.myprefix.Whom Mr. Smith" \-M"set Exif.Image.Artist Mr. Smith" image.jpg
.fi
.sp 1
When writing Exif, IPTC and XMP metadata,
.B exiv2
enforces only a correct
metadata structure. It is possible to write tags with types and values
different from those specified in the standards, duplicate Exif tags,
undefined tags, or incomplete metadata. While
.B exiv2
is able to read
all metadata that it can write, other programs may have difficulties
with images that contain non standard-conforming metadata.
.SS Command format
The format of a command is
.sp 1
.nf
\fBset | add | del\fP \fIkey\fP [[\fItype\fP] \fIvalue\fP]
.fi
.TP
.B set
Set the \fIvalue\fP of an existing tag with a matching \fIkey\fP or
add the tag.
.TP
.B add
Add a tag (unless \fIkey\fP is a non\-repeatable IPTC key; nothing
prevents you from adding duplicate Exif tags).
.TP
.B del
Delete all occurrences of a tag (requires only a \fIkey\fP).
.TP
.I key
Exiv2 Exif, IPTC or XMP key.
.TP
.I type
.B Byte | Ascii | Short | Long | Rational | Undefined | SShort | SLong | SRational | Comment
for Exif keys,
.br
.B String | Date | Time | Short | Undefined
for IPTC keys, and
.br
.B XmpText | XmpAlt | XmpBag | XmpSeq | LangAlt
for XMP keys.
.sp 1
A default \fItype\fP is used if none is explicitly given. The default
is determined based on \fIkey\fP.
.TP
.I value
The remaining text on the line is the value. It can optionally be
enclosed in single quotes ('\fIvalue\fP') or double quotes ("\fIvalue\fP").
.sp 1
The value is optional. Not providing any value is equivalent to an
empty value ("") and is mainly useful to create an XMP array property,
e.g., a bag.
.sp 1
The format of Exif \fBComment\fP values includes an optional charset
specification at the beginning:
.br
.B   [charset=Ascii|Jis|Unicode|Undefined ]\fIcomment\fP
.sp 1
.B Undefined
is used by default if the value doesn't start with a charset
definition.
.sp 1
The format for an IPTC \fBDate\fP value is:
.sp 1
    YYYY\-MM\-DD (year, month, day)
.sp 1
The format for an IPTC \fBTime\fP value is:
.sp 1
    HH:MM:SS (hours, minutes, seconds)
.sp
and may optionally be followed by:
.sp 1
   \-HH:MM or +HH:MM (hours, minutes ahead/behind UTC)
.sp 1
The format of \fBRational\fP (and \fBSRational\fP) is one of:
.sp 1
   integer | integer/integer | Fnumber | number
.sp 1
Rational Examples:
.sp 1
.nf
$ exiv2 "-Mset Exif.Photo.MaxApertureValue 557429/62500" X.jpg
$ exiv2 "-Mset Exif.Photo.MaxApertureValue F5.6" X.jpg
.fi
.sp 1
The Rational format Fnumber is for the convenience of setting aperture values.  Aperture values
are stored in Exif is an \fBAPEX\fP value which can be evaluated by the expression:
.sp 1
.nf
apex-value  =    log(Fnumber) * 2.0 / log(2.0)
number      = exp(apex-value * log(2.0) / 2.0)
.fi
.sp 1
The Rational format Fnumber is valid for any \fBRational\fP, even when the key is not an Aperture.
More information about \fBAPEX\fP value is available from: http://en.wikipedia.org/wiki/APEX_system
.sp 1
The format of XMP \fBLangAlt\fP values includes an optional language qualifier:
.nf
.B lang="\fIlanguage-code\fP\fI" text\fP
.fi
.sp
lang="x-default" is used if the value doesn't start with a language qualifier.
.sp 1
.nf
$ exiv2 -M'set Xmp.dc.title lang="de-DE" Euros' X.jpg
$ exiv2 -M'set Xmp.dc.title lang="en-GB" Pounds' X.jpg
$ exiv2 -M'set Xmp.dc.title lang="en-US" In God We Trust' X.jpg
$ exiv2 -M'set Xmp.dc.title All others pay cash' X.jpg
.fi
.sp 1
To remove a language specification, set the value to '' (empty string)
.nf
exiv2 -M'set Xmp.dc.title lang="en-US"' X.jpg
.fi
To remove all language specifications, delete the key:
.nf
$ exiv2 -M'del Xmp.dc.title' X.jpg
.fi
To register additional XMP namespaces, combine the command with:
.nf
\fBreg\fP \fIprefix\fP \fInamespace\fP
.br
.ne 4
.fi
.SS Command file format
Empty lines and lines starting with \fB#\fP in a command file are
ignored (comments). Remaining lines are commands as described above.
.br
.ne 40
.SH CONFIGURATION FILE
Exiv2 can read an optional configuration file ~/.exiv2 on Unix systems and %USERPROFILE%\\exiv2.ini on Windows (using a Visual Studio build).  Cygwin and MinGW/msys2 follow the unix convention and use ~/.exiv2  You can fine the location of the configuration file with the command:
.br
.sp 1
.nf
$ exiv2 --verbose --version --grep config_path
exiv2 0.27.0.1
config_path=/Users/rmills/.exiv2
.fi
.sp 1
The purpose of the configuration file is to define your own lenses for recognition by Exiv2.  The configuration file is in Windows .ini format and has sections for each of the major camera manufactures canon,nikon,pentax,minolta,olympus and sony.  The lens metadata is stored as a integer called the lensID.  You can change the lens name associated with any lensID.
.br
.sp 1
.nf
$ cat ~/.exiv2
[nikon]
146=Robin's Sigma Lens  <--- The name of your lens
.fi
.sp 1
You obtain the lensID for your camera with the command:
.nf
.sp 1
$ exiv2 -pv --grep lens/i http://clanmills.com/Stonehenge.jpg
0x0083 Nikon3       LensType           Byte       1  14
0x0084 Nikon3       Lens               Rational   4  180/10 2500/10 35/10 63/10
0x008b Nikon3       LensFStops         Undefined  4  55 1 12 0
0x000c NikonLd3     LensIDNumber       Byte       1  146 <--- This number
0x000d NikonLd3     LensFStops         Byte       1  55
.br
.ne 40
.SH EXAMPLES
.TP
exiv2 *.jpg
Prints a summary of the Exif information for all JPEG files in the directory.  The summary report is rather brief and presentation does not use the Family.Group.Tag convention.

If you use --grep pattern, the default becomes -pa.  See -g/grep above.

.nf
$ exiv2 -g Date http://clanmills.com/Stonehenge.jpg

.fi
.TP
exiv2 \-pi image.jpg
Prints the IPTC metadata of the image.
.TP
exiv2 rename img_1234.jpg
Renames img_1234.jpg (taken on 13\-Nov\-05 at 22:58:31) to 20051113_225831.jpg
.TP
exiv2 \-r':basename:_%Y%m' rename img_1234.jpg
Renames img_1234.jpg to img_1234_200511.jpg
.TP
exiv2 \-et img1.jpg img2.jpg
Extracts the Exif thumbnails from the two files into img1\-thumb.jpg
and img2\-thumb.jpg.
.TP
exiv2 \-it img1.jpg img2.jpg
Inserts (copies) metadata from img1.exv to img1.jpg and from img2.exv
to img2.jpg.
.TP
exiv2 \-ep1,2 image.jpg
Extracts previews 1 and 2 from the image to the files image\-preview1.jpg
and image\-preview2.jpg.
.TP
exiv2 \-eiX image.jpg
Extracts IPTC datasets into an XMP sidecar file image.xmp and in the
process converts them to "IPTC Core" XMP schema.
.TP
exiv2 \-iixX image.jpg
Inserts IPTC and XMP metadata from an XMP sidecar file image.xmp into
image.jpg.  The resulting IPTC datasets are converted from the "IPTC
Core" XMP schema properties in the sidecar file to the older IPTC IIM4
format. The inserted XMP properties include those in the "IPTC Core"
XMP schema.
.TP
exiv2 \-M"set Exif.Photo.UserComment charset=Ascii New Exif comment" image.jpg
Sets the Exif comment to an ASCII string.
.TP
exiv2 \-M"set Exif.GPSInfo.GPSLatitude 4/1 15/1 33/1" \\ \-M"set Exif.GPSInfo.GPSLatitudeRef N" image.jpg
Sets the latitude to 4 degrees, 15 minutes and 33 seconds north. The
Exif standard stipulates that the GPSLatitude tag consists of three
Rational numbers for the degrees, minutes and seconds of the latitude
and GPSLatitudeRef contains either 'N' or 'S' for north or south
latitude respectively.
.TP
exiv2 insert \-l/tmp -S.CRW /data/*.JPG
Copy all metadata from CRW files in the /tmp directory to JPG files
with corresponding basenames in the /data directory. Note that this
copies metadata as is, without any modifications to adapt it to the
requirements of the target format. Some tags copied like this may not
make sense in the target image.
.SH SEE ALSO
.TP
.I https://exiv2.org/sample.html#modify
Sample command files.
.TP
.I https://exiv2.org/metadata.html
Taglists with \fIkey\fP and default \fItype\fP values.
.SH AUTHORS
.B exiv2
was written by Andreas Huggel and others.  The Exiv2 project web site is https://exiv2.org.  The code is hosted on GitHub at https://github.com/exiv2/exiv2
.PP
This manual page was originally created for the Debian project by KELEMEN Peter <fuji@debian.org>.