[matdes]

is anyone using this particular blog's interpretation as production code??

No. And if you actually go to the link to the original question, you'll see that cat doesn't exist.

Last, I would disagree that `cat file` is equivalent to `select * from table`, his argument makes the comparison that `cat file` is equivalent to `table` itself, or `load data into table` which needs to happen before any relation can be performed against it.