The book is already outdated. The inclusion of Pascal was questionable, even in 1997. Outside some universities, Pascal has suffered a continual erosion of mindshare.
As for the choice of JavaScript as a scripting language, that still holds true today as a good choice. It is the dominant client-side scripting language for browsers, VBScript and JScript competitors notwithstanding.
The unix discussion could easily be modified to include linux. Minor changes here.
As for Microsoft DOS, it is a toss up whether this might still be discussed. Perhaps it might be replaced by an explanation of .NET?