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Table of Contents
File formats and file metadata
exiftool
see examples at https://exiftool.org/examples.html
List of all metadata fields
Metadata is usually stored in one of the following:
- XMP https://www.exiftool.org/TagNames/XMP.html (especially XMP dc Tags)
- EXIF https://exiftool.org/TagNames/EXIF.html
- IPTC https://exiftool.org/TagNames/IPTC.html Older format, replaced more and more by XMP.
list all metadata
exiftool /images/1988-klassenfoto-elzmatte-3.jpg
in RDF format:
exiftool -a -g -struct -X 1988-klassenfoto-elzmatte-3.jpg
get certain field
Where -Subject stands for the Subject field in XMP.
exiftool -s -Subject /images/1988-klassenfoto-elzmatte-3.jpg
overwrite field
delete/remove
exiftool -Subject="" -overwrite_original 1988-klassenfoto-elzmatte-3.jpg
remove single term
exiftool -Subject-="1988" -overwrite_original /image/1988-klassenfoto-elzmatte-3.tif
add single term
exiftool -Subject="1988" -overwrite_original /image/1988-klassenfoto-elzmatte-3.tif
to add more terms, keeping the existing ones:
exiftool -Subject+="1988" -Subject+="roger" -overwrite_original /image/1988-klassenfoto-elzmatte-3.tif
add multiple terms
This will overwrite existing terms.
exiftool -sep ", " -Subject="1988, roger" -overwrite_original /image/1988-klassenfoto-elzmatte-3.tif
droid
Format Identifier CLI and GUI based on PRONOM PUID
fido
Format Identifier CLI based on PRONOM PUID
https://github.com/openpreserve/fido
jhove
CLI and GUI tool for format identification and validation. Can be used e.g. to determine if a XML or SVG is valid.
https://jhove.openpreservation.org/
siegfried
CLI command tool. Shows PRONOM PUID, mimetype.
https://openpreservation.org/blogs/siegfried-pronom-based-file-format-identification-tool/
Sigcheck
Sigcheck is a command-line utility that shows file version number, timestamp information, and digital signature details, including certificate chains.
See https://learn.microsoft.com/en-us/sysinternals/downloads/sigcheck
veraPDF
PDF/A validator and repairer. GUI and CLI.