You can replace \begingroup by { and \endgroup by }
pdflatex -file-line-error
"\nonstopmode\nofiles\PassOptionsToPackage{active,tightpage,auctex}{preview}\AtBeginDocument{\ifx\ifPreview\undefined\RequirePackage[displaymath,floats,graphics,textmath,sections,footnotes]{preview}[2004/11/05]\fi}"
"{\ifdefined\UseRawInputEncoding\UseRawInputEncoding\fi\edef\x{\noexpand\input{primárias.tex}}\expandafter}\x"
and to be compatible with non-etex
as I see an \ifx\undefined test is used also before, so let's do same
pdflatex -file-line-error
"\nonstopmode\nofiles\PassOptionsToPackage{active,tightpage,auctex}{preview}\AtBeginDocument{\ifx\ifPreview\undefined\RequirePackage[displaymath,floats,graphics,textmath,sections,footnotes]{preview}[2004/11/05]\fi}"
"{\ifx\UseRawInputEncoding\undefined\else\UseRawInputEncoding\fi\edef\x{\noexpand\input{primárias.tex}}\expandafter}\x"
If filename is containing # or ~ it must have them like \string# and \string~
in the above
(I made a brief test with file primárias~.tex and the above with
\input{primárias\string~.tex} worked on command line)
Sorry for not having posted this initially
Jean-François
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