How to edit pdf metadata from command line?
Give exiftool a try; it is available from the package libimage-exiftool-perl in the repositories.
As an example, If you have a pdf file called drawing.pdf and you want to update its metadata, use the utility, exiftool, in this way:
exiftool -Title="This is the Title" -Author="Happy Man" -Subject="PDF Metadata" drawing.pdf
For some reason the Subject entered ends up in the keywords field of the metadata in the pdf file. not a problem in some cases, even desirable, however, this may be problematic: evince and the nautilus metadata previewer do not show this, but Adobe Acrobat viewer and PDF-XChange viewer do.
The program will create a backup of the original file if you do not use the -overwrite_original switch. This means a duplicate will exist in the folder where the updated pdf is. From the example above, a file named drawing.pdf_original will be created.
Use the overwrite switch at your own risk. My suggestion is not to use it and script something to move this file to a better location just in case.
https://exiftool.org/gui/
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