css: green noise background, lighter body, header and footer background, shadows, link colors, lighter footnotes border, copyright 2019-2020
#!/bin/bash
FILE="$1";
COMMENT="$2";
COPYRIGHT="Mouse utilities (c) $(date +%Y) Frantisek Kucera, Frantovo.cz, GlobalCode.info; copylefted under the GNU FDLv1.3+ license; source: https://mouse.globalcode.info/"; # this tag should be in ASCII, see http://www.exiv2.org/tags.html
[ -n "$FILE" ] && exiv2 -M "set Exif.Image.Copyright $COPYRIGHT" "$FILE";
[ -n "$COMMENT" ] && exiv2 -M "set Exif.Photo.UserComment charset=Unicode $COMMENT" "$FILE";