I'm assuming that you are using Adobe Acrobat Reader or macOS Preview to open the PDF, if not what are you using?
1) Try using --filename instead of -f. The docs at tabcmd Commands say that the structure you used should work for --filename, I'm wondering if the -f option isn't also using it. If that doesn't work, then...
2) Try appending a .pdf to the URL. I'm 99% certain that will work.
Thanks. That worked.
your answer worked for me also Glen.
Thank you very much for ur reply to venkatesh.
Also thanks for venkatesh for asking that Quetion.
Thanks to forum.