How to use the diff command: 2
Commandsubstitution`...`substitutestheoutputofthecommandintothecommandline,sodiffseesthelistoffilesinbothdirectoriesasarguments.,diffisashellcommandthatcomparesthecontentoffilesandreportsdifferences.Thetermdiffisalsousedtoidentifytheoutputoftheco...。參考影片的文章的如下: