GNU/Linux Desktop Survival Guide by Graham Williams
Desktop Survival Project Home Preface Advocacy History Distributions Installing GNU/Linux Basic Survival Wajig Applications AI, Machine Learning, Data Science Audio Backup Booting Cameras CD Chinese ChRoot Clock Cloud Computing Command Line Databases DIA Directories Disks Emacs Email Evolution Files File Systems Firewalls Floppy Disks FreedomBox Fonts Ghemical Glade GNOME Graphics, Images, Photos Hardware Initialisations on Booting Installation Examples IOT Java KDE Kernels Keyboard Konqueror KVM Switch LaTeX Log System Login Magellan MATE Mathematics Memory Modems Mounting Devices MS/Windows Music MySQL Nautilus Networks NFS NT File System Oracle Packages Partitions Passwords PDF Power Management PPP Presentations Printing Python R Remote Desktops Rsync Samba Scanning Science Screens Security Sketch Spell SPlus Spruce Spreadsheet SSH SUDO Swap Teradata Data Warehouse Themes TV Unity USB Version Control Video Virtualization Voice over IP World Wide Web WebCam WordPress Web Sites Word Processing and Printing X XML Troubleshooting Index

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Comparing PDFs

20190906 The diffpdf tool provides a graphical summary of differences between two pdf documents.

$ diffpdf doc01.pdf doc02.pdf

This will not find differences for image based PDF files that might come for example from a document scan. Such a pdf document contains an image of the text rather than the text itself, and hence it is not possible to compare text between such documents as is. See Section 66.8