UPS Tools 
Installation
Builds can be downloaded from the releases page. Put the executable somewhere in your PATH. If you have the Go toolchain setup, you can also run go get github.com/rameshvarun/ups to install from source.
Commands
ups diff -b base -m modified -o output.ups
Create a UPS patch file.
ups apply -b base -p patch.ups -o output
Apply a UPS patch to a file.