Excellent link; thank you. It references _The Unix Programming Environment_, Kernighan & Pike (1984), pp. 77-79, "A digression on echo" which I found in PDF an

Excellent link; thank you. It references _The Unix Programming Environment_, Kernighan & Pike (1984), pp. 77-79, "A digression on echo" which I found in PDF and is an immensely enjoyable and enlightening read :) [1] http://books.cat-v.org/computer-science/unix-programming-environment/The.Unix.Programming.Environment.pdf http://books.cat-v.org/computer-science/unix-programming-env...