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Yes, the online documentation for pdfmanipulate is minimal, quoted by PeterT above in its entirety. The manual should describe what the command does and its available options, and perhaps include some examples, not merely tell you to run the program to get help.
I guess I did misinterpret "split." Decent documentation would describe what it does. But if "split 11-12" gets you 11 and 12, as Serpentine says, shouldn't "split 8-8" give you only 8? I tried that, too ("8-8" appears to be equivalent to "8"). How bizarre that it can extract ranges of two or more, but not a single page, the lone exception!
Mysteriously, files created by specifying -o did not get the requested name. For example, -o file01.pdf might result in file23.pdf or file40.pdf.
But no matter: I found another program, pdftk, (which appears to be quite robust) to do the page extraction.
The real problems came with "crop," which I was forced to rely on as I couldn't find anything else that cropped via a command line. As I said, it worked only on about 85% of the files I needed to crop. The files were all similar, so I couldn't tell you any pattern as to what it had trouble with. In those 15% of cases the resulting files couldn't be opened by Adobe Reader due to a PDF format error.
Anyway, perhaps Calibre is a good ebook organizer (I didn't explore it) but pdfmanipulate I'm afraid is not fit for public consumption.
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