[texhax] How to test for existence of a macro?

Vafa Khalighi vafa at users.berlios.de
Sat Aug 29 03:13:46 CEST 2009

Use \show




> \TeX=macro:
->T\kern -.1667em\lower .5ex\hbox {E}\kern -.125emX.

which means \TeX is defined and it is a macro not a primitive.



> \pdfoutput=\pdfoutput.

which means \pdfoutput exist and it is a primitive.

Best wishes,
Vafa Khalighi
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