pdftk basic usage

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-To merge (concatenate) pdfs:
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-$ pdftk inputs cat output newfile.pdf
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-To merge all pdfs:
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-$ pdftk *.pdf cat output newfile.pdf
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-To break a pdf into single page files:
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-$ pdftk input.pdf burst
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-To combine parts of two or more files, use handles:
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-$ pdftk A=firstfile.pdf B=secondfile.pdf cat A1-7 B1-5 A8 output newfile.pdf
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-========================================================================
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-To edit metadata is a multistep process:
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-1) Dump the pdf metadata:
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-$ pdftk input.pdf dump_data metadata.txt
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-2) Edit the metadata (Geany appears to work), adding:
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-InfoBegin
-InfoKey: Author
-InfoValue: Kenneth John Odle
-InfoBegin
-InfoKey: Title
-InfoValue: Journal #42
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-(For "Title" enter whatever you want to see in the document's title bar as you read it.)
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-3) Update the metadata in the pdf file:
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-$ pdft input.pdf update_info metadata.txt output.pdf
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-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.
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-See https://sejh.wordpress.com/2014/11/26/changing-pdf-titles-with-pdftk/