It's baffling to see people insist that that's the UNIX philosophy when the UNIX philosophy has always been about monolithic kernels over microkernels, so "do one thing" is out the window, and about worse-is-better over do-the-right-thing (
https://www.dreamsongs.com/RiseOfWorseIsBetter.html), so "do it well" is out the window.
And the userspace tools don't follow this either. Quoting http://prog21.dadgum.com/139.html :
> The UNIX ls utility seemed like a good idea at the time. It's the poster child for the UNIX way: a small tool that does exactly one thing well. Here that thing is to display a list of filenames. But deciding exactly what filenames to display and in what format led to the addition of over 35 command-line switches. Now the man page for the BSD version of ls bears the shame of this footnote: "To maintain backward compatibility, the relationships between the many options are quite complex."
Why, for instance, does ls have its own sorting options if the sort command exists? If ls, the most quintessential UNIX command, can't do one thing and do it well, why should anything else?