You can connect to computers anywhere to run interactive sessions, transfer files, etc. Unix, in general, is quite advanced in terms of networking. This makes it relatively easy to maintain and change. Because of this, many people who know Unix also have a good C background. A drawback to this is that Unix expects its users not to make too many mistakes.
Some commands are different only in one letter.
Unix, unlike VMS or MS-DOS, will happily let you, in default mode for rm , destroy your entire account without even asking for confirmation. Unix is both powerful and dangerous at the same time.