Thanks for the quick response. I'm getting close.
If I get a list of fields through calibredb set_metadata -l, on my list is format:Library of Congress and Field name: #LOC.
If I then try to edit the metadata of book id 45070 to change the LOC number to LC385, it looks like the command is "calibredb set_metadata --field #loc:LC385 45070". This gets me an error that the field option requires an argument.
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