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Yeah yeah, another "render man page in pdf", but this time it creates a temporary PDF that stays resident in memory for viewing, but is eliminated on the filesystem.
Replace evince with your PDF viewer of choice.
There are 4 alternatives - vote for the best!
If you can do better, submit your command here.
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Firstly, there is an error: after /dev/null there is "&;" which should only be "&".
Secondly, why would anyone want to view manpages in pdf format? I can't think of any reason.
Why not just pipe the output to gedit? That's a much simpler command, still temporary, and I can't think of anything you can do with a pdf you can't do with text in gedit. And if you decide you need a pdf, you can print to a file from within gedit and get one.
Readability of a PDF is pretty damned fine. Sometimes I want the man page in an easily printable, pretty, page oriented format like PDF. It's silly to ask why one would do this.