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Merge two similar folders

rsync -avun source/ destination/ (note the ending slashes, those are important)

  • -a archive mode
    • -a = -rlptgoD (recursive + preserve everything)
    • -r recursive, -l symlinks, -p preserve permissions, -t preserve modification times, -g preserve ownership, -o preserve ownder, -D Preserve device files and special files
  • -v verbose, -vv very verbose, -vvv very very verbose
  • -n dry run
  • -u update (skip files that are newer at destination)