The comma-separated number pairs are starting line number of hunk, and the number of lines in the hunk. The one starting with a minus sign is for the original

The comma-separated number pairs are starting line number of hunk, and the number of lines in the hunk. The one starting with a minus sign is for the original file, the one with the plus prefix is for the new file. See https://www.gnu.org/software/diffutils/manual/html_node/Detailed-Unified.html https://www.gnu.org/software/diffutils/manual/html_node/Deta... for a canonical source and more detail