<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" xml:id="chap-functions"> <title>Functions reference</title> <para> The nixpkgs repository has several utility functions to manipulate Nix expressions. </para> <xi:include href="functions/library.xml" /> <xi:include href="functions/overrides.xml" /> <xi:include href="functions/generators.xml" /> <xi:include href="functions/debug.xml" /> <xi:include href="functions/fhs-environments.xml" /> <xi:include href="functions/shell.xml" /> <xi:include href="functions/dockertools.xml" /> </chapter>