我们在排错的时候，经常希望知道出错的宏是在哪里定义的，然后通过比对定义和现有情况判断错误原因。
LeoLiu 在 TeX.SX 给出了一个利用 filehook 宏包实现的方法，效果拔群！当然，方法有些讨巧。
\documentclass{article}
\usepackage{filehook,currfile}
\newwrite\finder
\immediate\openout\finder=\jobname.fnd
\def\searchmacro#1{
\AtBeginOfFiles{\ifdefined#1
\expandafter\def\csname \currfilename:found\endcsname{}%
\fi}
\AtEndOfFiles{\ifdefined#1
\unless\ifcsname \currfilename:found\endcsname
\immediate\write\finder{found in '\currfilename'}%
\fi\fi}}
\searchmacro\url
\usepackage{hyperref}
\begin{document}
dummy
\end{document}
\jobname.fnd 里我们能找到
found in 'url.sty'
found in 'hyperref.sty'
\url 是在 url.sty 里定义的，而 url.sty 被 hyperref.sty 调用。
We would be glad to know where a certain macro is defined, when we are debugging. LeoLiu provided a method by using the package filehook , on the website TeX.SX. It’s really great!
The code is somewhat tricky:
\documentclass{article}
\usepackage{filehook,currfile}
\newwrite\finder
\immediate\openout\finder=\jobname.fnd
\def\searchmacro#1{
\AtBeginOfFiles{\ifdefined#1
\expandafter\def\csname \currfilename:found\endcsname{}%
\fi}
\AtEndOfFiles{\ifdefined#1
\unless\ifcsname \currfilename:found\endcsname
\immediate\write\finder{found in '\currfilename'}%
\fi\fi}}
\searchmacro\url
\usepackage{hyperref}
\begin{document}
dummy
\end{document}
found in 'url.sty'
found in 'hyperref.sty'
\jobname.fnd . That is to say, \url is defined in url.sty , which is inputed by hyperref.sty .
选自： http://liam0205.me/LaTeX-How-to-find-out-where-a-macro-is-defined/
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