running latex from .bat file fails

Question

I am trying to write a .bat file for my Windows machine that removes page numbers and converts the pdf to a png file with pdfcrop and pdftoppm. The conversion part is not an issue; running latex from the .bat file is what I'm having trouble with. For example if I make a file mycmd.bat containing

pdflatex '\AtBeginDocument{\pagestyle{empty}}\input{%1}'

and run mycmd bbb on the file bbb.tex

\documentclass{article}
\begin{document}
some text
\end{document}

then in the terminal I get

C:\Users\<user>\Downloads> mycmd bbb

C:\Users\<user>\Downloads>pdflatex '\AtBeginDocument{\pagestyle{empty}}\input{bbb}'
pdflatex: security risk: running with elevated privileges
This is pdfTeX, Version 3.141592653-2.6-1.40.25 (MiKTeX 23.5) (preloaded format=pdflatex.fmt)
 restricted \write18 enabled.
entering extended mode
! I can't find file `''.
<to be read again>
                   \protect
<*> '\AtBeginDocument
                     {\pagestyle{empty}}\input{bbb}'
(Press Enter to retry, or Control-C to exit)
Please type another input file name:

But if I run the command pdflatex '\AtBeginDocument{\pagestyle{empty}}\input{bbb}' directly in the terminal then it works fine.

My only guess is that latex has an issue with the percent in %1 from the .bat file. If this is the issue, how can I fix it? If not, what is going wrong?

Answer 1

As @user202729 mentioned in the comments, you need to use double quotes around the entire argument of pdflatex:

pdflatex "\AtBeginDocument{\pagestyle{empty}}\input{%1}"

Probably Windows-specific.