a와 b를 비교해서 만들어진 sw.diff파일을 가지고 다시 b를 만드는 문제

diff 명령어를 사용해서

diff a sw.diff

이렇게 패치를 하게 되면 a 파일에 a와 b의 차이가 패치가 되어서 a파일이 b가 된다.

결과

Episode V, A NEW H0PE It is a period of civil war
Rebel spaceships, striking from a hidden base, have won their first victory against the evil Galactic Empire.
During the battle, Rebel spies managed to steal secret plans to the Empire's ultimate weapon, the STAR DEATH, an armored space station with enough power to destroy an entire planet.

Pursued by the Empire's sinister agents,
Princess Mehdi races home aboard her starship, custodian of the stolen plans that can save her people and restore the dictatorship to the galaxie..