Update cheatsheets

cpdf

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cpdf
+
+> Manipulate PDF files.
+> More information: <https://www.coherentpdf.com/cpdfmanual/cpdfmanual.html>.
+
+- Select pages 1, 2, 3 and 6 from a source document and write those to a destination document:
+
+`cpdf {{path/to/source_document.pdf}} {{1-3,6}} -o {{path/to/destination_document.pdf}}`
+
+- Merge two documents into a new one:
+
+`cpdf -merge {{path/to/source_document_one.pdf}} {{path/to/source_document_two.pdf}} -o {{path/to/destination_document.pdf}}`
+
+- Show the bookmarks of a document:
+
+`cpdf -list-bookmarks {{path/to/document.pdf}}`
+
+- Split a document into ten-page chunks, writing them to `chunk001.pdf`, `chunk002.pdf`, etc:
+
+`cpdf -split {{path/to/document.pdf}} -o {{path/to/chunk%%%.pdf}} -chunk {{10}}`
+
+- Encrypt a document using 128bit encryption, providing `fred` as owner password and `joe` as user password:
+
+`cpdf -encrypt {{128bit}} {{fred}} {{joe}} {{path/to/source_document.pdf}} -o {{path/to/encrypted_document.pdf}}`
+
+- Decrypt a document using the owner password `fred`:
+
+`cpdf -decrypt {{path/to/encrypted_document.pdf}} owner={{fred}} -o {{path/to/decrypted_document.pdf}}`
+
+- Show the annotations of a document:
+
+`cpdf -list-annotations {{path/to/document.pdf}}`
+
+- Create a new document from an existing one with additional metadata:
+
+`cpdf -set-metadata {{path/to/metadata.xml}} {{path/to/source_document.pdf}} -o {{path/to/destination_document.pdf}}`