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pdfconcat is a small and fast command-line utility written in ANSI C that can concatenate (merge) several PDF files into a long PDF document. External librariesIt means that running this command will create a new PDF file named “PDF3.pdf” which will have the merged contents of both the files “PDF1.pdf” and “PDF2.pdf”. For, combine specific pages of PDF files into one file, we will have to pass to the convert command our files with the specific page numbers in brackets. For