ex | extract
    Extract metadata to *.exv, XMP sidecar (*.xmp) and thumbnail image files. Modification commands can be applied on-the-fly.
in | insert
    Insert metadata from corresponding *.exv, XMP sidecar (*.xmp) and thumbnail files. Use option -S .suf 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.