bspatch - apply a patch built with bsdiff(1)
bspatch 〈oldfile〉 〈newfile〉 〈patchfile〉
bspatch generates 〈newfile〉 from 〈oldfile〉 and 〈patchfile〉 where 〈patchfile〉 is a binary patch built by bsdiff(1). bspatch uses memory equal to the size of 〈oldfile〉 plus the size of 〈newfile〉, but can tolerate a very small working set without a dramatic loss of performance.
Colin Percival 〈firstname.lastname@example.org〉