(latex2e.info)Splitting the input

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24 Splitting the input
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LaTeX lets you split a large document into several smaller ones.  This
can simplify editing or allow multiple authors to work on the document.
It can also speed processing.

   Regardless of how many separate files you use, there is always one
"root file", on which LaTeX compilation starts.  This shows such a file
with five included files.

     \documentclass{book}
     \includeonly{  % comment out lines below to omit compiling
       pref,
       chap1,
       chap2,
       append,
       bib
       }
     \begin{document}
     \frontmatter
     \include{pref}
     \mainmatter
     \include{chap1}
     \include{chap2}
     \appendix
     \include{append}
     \backmatter
     \include{bib}
     \end{document}

This will bring in material from 'pref.tex', 'chap1.tex', 'chap2.tex',
'append.tex', and 'bib.tex'.  If you compile this file, and then comment
out all of the lines inside '\includeonly{...}' except for 'chap1,' and
compile again, then LaTeX will only process the material in the first
chapter.  Thus, your output will appear more quickly and be shorter to
print.  However, the advantage of the '\includeonly' command is that
LaTeX will retain the page numbers and all of the cross reference
information from the other parts of the document so these will appear in
your output correctly.

   Note: Larger book template for another example of '\includeonly'.

\endinput

Stop including material from a file.

\include & \includeonly

Conditionally include files.

\input

Unconditionally include a file.