從差異重建文件

假設我有一個文件foo和一個文件bar。我現在呼叫以下命令：

$ diff foo bar > diff_foobar
$ rm bar

是否有一種（n 簡單）的方法來以程式方式重建缺失bar的foo和diff_foobar？

是的，您應用了更新檔：

你做了：

$ diff foo bar > diff_foobar
$ rm bar

現在做：

$ patch  foo -o bar < diff_foobar

從差異重建文件，也稱為“應用差異”，是實用程序patch所做的：

## Create two arbitrary files, `original' and `altered':
$ seq 0 3 >original
$ seq 7 11 >altered

## Compute a diff from `original' to `altered':
$ diff original altered >diff

## Copy `original' before patching it
$ cp -vi original original.0
`original' -> `original.0'
$ patch <diff original # This modifies `original'!
patching file original

## Confirm that we rebuilt the file from `original' and `diff`
$ diff --report-identical-files original altered
Files original and altered are identical

patch 命令也有很多選項，特別是反向應用更新檔。

引用自：https://unix.stackexchange.com/questions/621358