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

[Vafa Khalighi]

Use \show

e.g

\show\TeX

Gives:

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

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

\show\pdfoutput

gives:

> \pdfoutput=\pdfoutput.

which means \pdfoutput exist and it is a primitive.

Best wishes,
Vafa Khalighi
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