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I would like to use a .tex file with all my custom command definitions, but I do not know how I can then use these commands in my main.tex file. I know about \include and \input, but iirc these are used to insert pages into your eventual document, right?

Smamorti7
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    You want \input. Please have a look at https://tex.stackexchange.com/q/246/82917 – campa Oct 21 '21 at 09:37
  • You can use \input{mycommands} in the preamble as well only for commands in a .tex file, but if you will use a set of commands consistently in several documents, consider make a package (.sty extension) or even your own class (.cls extension) in order to simplify the preamble. – Fran Oct 21 '21 at 09:46

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\input if the file has an extension .tex but better give the file the extension .sty, say mycommands.sty then use \usepackage{mycommands} in the preamble.

David Carlisle
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