I am following the online instructions and trying to rotate all pages of a PDFs 90 degrees clockwise like so
pdftk in.pdf cat 1E output out.pdf
But then I get the following error
Error: Unexpected text in page range end, here:
1
Exiting.
Acceptable keywords, for example: "even" or "odd".
To rotate pages, use: "north" "south" "east"
"west" "left" "right" or "down"
Errors encountered. No output created.
Done. Input errors, so no output created.
I can't imagine what I'm doing wrong