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Possible Duplicate:
Where do I find out how a command/environment is defined?
Macro find tool

When I am reading the other's LaTeX codes, I always find new commands I have never read before of.

Is there any method to search for the command I want to know?

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Looking in the preamble to see if it's defined by the author or searching in google/here. – Manuel Dec 14 '12 at 16:10
for anyone interested,LaTeX Reference Manual, alternatively you can type at the command prompt texdoc latex2e for LaTeX and texdoc texbytopic for TeX and Prof Knuth's TeX82 book by texdoc tex. for more info Which books can I read via texdoc ?. – texenthusiast Dec 14 '12 at 16:42
some good suggestions in the question Is there a printable version of a reference manual for all TeX primitives? – barbara beeton Dec 14 '12 at 16:44

marked as duplicate by Stephan Lehmke, TH., Andrew Swann, Werner, Thorsten Dec 14 '12 at 17:39

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