GNU Info

(latex.info)Splitting the Input

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Enter node , (file) or (file)node

Splitting the Input
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   A large document requires a lot of input.  Rather than putting the
whole input in a single large file, it's more efficient to split it into
several smaller ones.  Regardless of how many separate files you use,
there is one that is the root file; it is the one whose name you type
when you run LaTeX.

\include

Conditionally include a file.

\includeonly

Determine which files are included.

\input

Unconditionally include a file.