~ $ exiv2 --help
exiv2: Unrecognized option --
exiv2: Unrecognized extract target `l'
Usage: exiv2 [ options ] [ action ] file ...

Manipulate the Exif metadata of images.

Actions:
ad | adjust Adjust Exif timestamps by the given time. This action
requires at least one of the -a, -Y, -O or -D options.
pr | print Print image metadata.
rm | delete Delete image metadata from the files.
in | insert Insert metadata from corresponding *.exv files.
Use option -S to change the suffix of the input files.
ex | extract Extract metadata to *.exv, *.xmp and thumbnail image files.
mv | rename Rename files and/or set file timestamps according to the
Exif create timestamp. The filename format can be set with
-r format, timestamp options are controlled with -t and -T.
mo | modify Apply commands to modify (add, set, delete) the Exif and
IPTC metadata of image files or set the JPEG comment.
Requires option -c, -m or -M.
fi | fixiso Copy ISO setting from the Nikon Makernote to the regular
Exif tag.
fc | fixcom Convert the UNICODE Exif user comment to UCS-2. Its current
character encoding can be specified with the -n option.

Options:
-h Display this help and exit.
-V Show the program version and exit.
-v Be verbose during the program run.
-b Show large binary values.
-u Show unknown tags.
-g key Only output info for this key (grep).
-n enc Charset to use to decode UNICODE Exif user comments.
-k Preserve file timestamps (keep).
-t Also set the file timestamp in 'rename' action (overrides -k).
-T Only set the file timestamp in 'rename' action, do not rename
the file (overrides -k).
-f Do not prompt before overwriting existing files (force).
-F Do not prompt before renaming files (Force).
-a time Time adjustment in the format [-]HH[:MM[:SS]]. This option
is only used with the 'adjust' action.
-Y yrs Year adjustment with the 'adjust' action.
-O mon Month adjustment with the 'adjust' action.
-D day Day adjustment with the 'adjust' action.
-p mode Print mode for the 'print' action. Possible modes are:
s : print a summary of the Exif metadata (the default)
a : print Exif, IPTC and XMP metadata (shortcut for -Pkyct)
t : interpreted (translated) Exif data (-PEkyct)
v : plain Exif data values (-PExgnycv)
h : hexdump of the Exif data (-PExgnycsh)
i : IPTC data values (-PIkyct)
x : XMP properties (-PXkyct)
c : JPEG comment
p : list available previews
-P flgs Print flags for fine control of tag lists ('print' action):
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
t : interpreted (translated) data
h : hexdump of the data
-d tgt Delete target(s) for the 'delete' action. Possible targets are:
a : all supported metadata (the default)
e : Exif section
t : Exif thumbnail only
i : IPTC data
x : XMP packet
c : JPEG comment
-i tgt Insert target(s) for the 'insert' action. Possible targets are
the same as those for the -d option, plus a modifier:
X : Insert metadata from an XMP sidecar file <file>.xmp
Only JPEG thumbnails can be inserted, they need to be named
<file>-thumb.jpg
-e tgt Extract target(s) for the 'extract' action. Possible targets
are the same as those for the -d option, plus a target to extract
preview images and a modifier to generate an XMP sidecar file:
p[<n>[,<m> ...]] : Extract preview images.
X : Extract metadata to an XMP sidecar file <file>.xmp
-r fmt Filename format for the 'rename' action. The format string
follows strftime(3). The following keywords are supported:
:basename: - original filename without extension
:dirname: - name of the directory holding the original file
arentname: - name of parent directory
Default filename format is %Y%m%d_%H%M%S.
-c txt JPEG comment string to set in the image.
-m file Command file for the modify action. The format for commands is
set|add|del <key> [[<type>] <value>].
-M cmd Command line for the modify action. The format for the
commands is the same as that of the lines of a command file.
-l dir Location (directory) for files to be inserted from or extracted to.
-S .suf Use suffix .suf for source files for insert command.