Ken Thompson — American Scientist born on February 04, 1943,

Kenneth Lane "Ken" Thompson, commonly referred to as ken in hacker circles, is an American pioneer of computer science. Having worked at Bell Labs for most of his career, Thompson designed and implemented the original Unix operating system. He also invented the B programming language, the direct predecessor to the C programming language, and was one of the creators and early developers of the Plan 9 operating systems. Since 2006, Thompson has worked at Google, where he co-invented the Go programming language... (wikipedia)

In fact, we started off with two or three different shells and the shell had life of its own.
I am a programmer.
In college, before video games, we would amuse ourselves by posing programming exercises.
I think the major good idea in Unix was its clean and simple interface: open, close, read, and write.
When in doubt, use brute force.