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Old 06-26-2020, 02:56 PM   #633
DaltonST
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Windows does not have the equivalent built-in command-line tools, which means that I cannot develop a new JS GUI Tool that does what you suggest.

However, in Linux, you could write a Python script executed by calibredb that accumulates that data by book and writes to a .csv text file. Then, use the Job Spy plugin's Tool "Import CSV to Update Metadata" to update your chosen custom columns. Or, you could also use calibredb to update your custom columns: calibredb.exe set_custom [options] columnlabel bookid value

See the user guide for calibredb for all of its CLI options.
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