The book "The AWK Programming Language" by Aho, Weinberger and Kernighan is a real gem. Chapter 6 is "Little Languages", it shows you how to write interpreters

The book "The AWK Programming Language" by Aho, Weinberger and Kernighan is a real gem. Chapter 6 is "Little Languages", it shows you how to write interpreters and compilers using AWK. In particular it even shows how to start a bootstrap: you write a compiler to a subset of AWK that writes down C code. You don't need to read all the 5 chapters before, only Chapter 1 is enough.