Comparing files using diff
diffprovidestwooutputformatsthatshowcontextaroundthedifferinglines:contextformatandunifiedformat.,Theunifiedoutputformatisavariationonthecontextformatthatismorecompactbecauseitomitsredundantcontextlines.,ADIFFfileisasinglefileshowingthedifference...。參考影片的文章的如下: