Xidel!

TXR is a pragmatic, convenient data munging language oriented toward processing of text from files or streams, using multiple programming paradigms. It is influenced by concepts from text processing languages such as awk or perl, pattern matching concepts from logic/AI programming, Lisp and functional languages.

XMLStarlet is a set of command line utilities (tools) which can be used to transform, query, validate, and edit XML documents and files using simple set of shell commands in similar way it is done for plain text files using UNIX grep, sed, awk, diff, patch, join, etc commands.