Sample Markdown used as a Reproducible Example (GitHub hyperlink)
I pasted the markdown from the hyperlink above into the Atom text editor and saved it as a documentation.md file. I can run the following two seperate Pandoc commands and each of them works to reduce the margins on my pdf -and- increase the font size to 12 on the output pdf.
pandoc -s -V documentation.md geometry:margin=1in -o documentation.pdf
pandoc -s -V documentation.md fontsize=12 -o documentation.pdf
pandoc -s -V documentation.md geometry:margin=1in fontsize=12 -o documentation.pdf
pandoc geometry:margin=1in openBinaryFile: does not exist (No such file or
pandoc documentation.md -V geometry:margin=1in -V fontsize:12pt -s -o documentation.pdf
Pandoc's FAQs state:
How do I change the margins in PDF output?
will set the margins to one inch on each side.
geometry:margin=1in is the value of the
-V flag. However, you have the filename
documentation.md between the flag and its value. Therefore, you are causing the value of the flag to be
geometry:margin=1in is assumed to be a filename. After all, any string of text no preceded by a flag should be a filename (which explains the "No such file or directory" error).
By way of explanation, the documentation for the
-V flag gives this format:
Note that the brackets in
[:VAL] indicate that that part is optional. So
-V KEY is completely valid with no value, which means that
-V documentation.md resulted in
documentation.md being the
KEY of the
-V flag (with a default
true as per the docs).
-V geometry:margin=1in is an especially weird case and its easy to see how one might be confused by it. In this case however,
-V is the flag,
geometry is the "KEY" and
margin=1in is the "VAL". I realize that
margin=1in looks like a
KEY=VAL, but in this instance it is all a "VAL" on its own. Presumably, Pandoc does some further processing on it later to break the "VAL" up into its parts.
Of course, fontsize is another variable, so you need a second
-V flag to define that variable:
-s flag does not accept a value, so I moved it so that that is clear.