Update

unix_philosophy.md

@@ -11,6 +11,8 @@ In 1978 [Douglas McIlroy](mcilroy.md) has written a short overview of the Unix s
 
 This has later been condensed into: do one thing well, write programs to work together, make programs communicate via text streams, a universal interface.
 
+Details such as to what extent/extreme this minimalism ("doing only one thing") should be taken are of course a hot topic of many debates and opinions, the original Unix hackers very often very strict, famous example of which is the "cat -v considered [harmful](harmful.md)" presentation bashing a relatively simple function added to the [cat](cat.md) program that should only ever concatenate files. Some tolerate adding some convenience functions to simple programs, especially nowadays.
+
 **Simple example**: maybe the most common practical example that can be given is [piping](pipe.md) small [command line](cli.md) utility programs; in Unix there exist a number of small programs that do *only one thing but do it well*, for example the [`cat`](cat.md) program that only displays the content of a file, the [`grep`](grep.md) program that searches for patterns in text etc. In a command line we may use so called [pipes](pipe.md) to chain some of these simple programs into more complex processing pipelines. Let's say we want to for example automatically list all first and second level headings on given webpage and write them out alphabetically sorted. We can do it with a command such as this one:
 
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