This is one of those articles written by someone who wants to make themselves look important but doesn't really understand the language/tool they are demonstrat

This is one of those articles written by someone who wants to make themselves look important but doesn't really understand the language/tool they are demonstrating. $_ shouldn't be used in scripts but is okay for an interactive session. Also he uses compound commands such as { cmd1 ; cmd2 } without the semicolon req: { cmd1 ; cmd2 ; }