Merge branch 'main' of https://git.kjodle.net/kjodle/pdftk-notes into main

pdftk basic usage

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+To merge (concatenate) pdfs:
+
+$ pdftk inputs cat output newfile.pdf
+
+
+To merge all pdfs:
+
+$ pdftk *.pdf cat output newfile.pdf
+
+
+To break a pdf into single page files:
+
+$ pdftk input.pdf burst
+
+
+To combine parts of two or more files, use handles:
+
+$ pdftk A=firstfile.pdf B=secondfile.pdf cat A1-7 B1-5 A8 output newfile.pdf
+
+========================================================================
+
+To edit metadata is a multistep process:
+
+1) Dump the pdf metadata:
+
+$ pdftk input.pdf dump_data metadata.txt
+
+2) Edit the metadata (Geany appears to work), adding:
+
+InfoBegin
+InfoKey: Author
+InfoValue: Kenneth John Odle
+InfoBegin
+InfoKey: Title
+InfoValue: Journal #42
+
+(For "Title" enter whatever you want to see in the document's title bar as you read it.)
+
+3) Update the metadata in the pdf file:
+
+$ pdft input.pdf update_info metadata.txt output.pdf
+
+Note that you must write to another file, as pdftk cannot overwrite the original file.
+Thus, make the file you save the scan as different than what you want the final file to be named.
+
+See https://sejh.wordpress.com/2014/11/26/changing-pdf-titles-with-pdftk/