[texhax] [read this] How to make the following condition: if..., then..., else...

H hre
Tue Oct 3 18:26:22 CEST 2006

Hello, how are you.

How can I make the following condition in a .tex (main) document:  
if..., then..., else...?
For example, I have this:


But, the problem: it never will be available. So, I pretend to use  
if..., then,... else... for no allowing LaTeX to make an error as  
follow as:

if "pack.tex" exists, then input (include) it, else ignore it.

I hope an answer as soon as you read this, please.

Thank you, very much.
Have a good day.

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