How to have no pagebreak after \include in LaTeX

My LaTeX makes me pagebreaks after each subsection because my subsections are in separate files. I use the command \include{file} which adds a pagebreak after the use of it.

I would like to have no pagebreak caused by the use of \include{file}.

How can you no pagebreak after the use of include -command?

\include always uses \clearpage, a not entirely sensible default. It is intended for entire chapters, not for subsections (why would you want subsections in separate files, anyway?).

You can fix it either by using \input{filename} or loading the newclude package and writing \include*{filename} instead.

You can stop pagebreaks caused by \include by placing \let\clearpage\relax before it. So,

\let\clearpage\relax
\include{file1}
\include{file2}
\include{file3}

would put the contents of the three files (and any subsequently included files) together without a pagebreak between them. If you want to stop relaxing the \clearpage command, then wrap the files to include without pagebreaks within a group like this:

\begingroup
\let\clearpage\relax
\include{file1}
\include{file2}
\endgroup
\include{file3}

This will stop a pagebreak between file1 and file2, but insert the normal pagebreak after file2. (Note: I do not know if this interferes with referencing and page numbering, though I imagine it should be OK.)