I had fedora a couple of years back and I saw the man pages for the following there:

  • unistd.h
  • sys/types.h
  • standard typedefs (suffixed by _t), etc.

I tried man unistd But it didn't find it. I think those pages are not there in Ubuntu Although man stdio works.


  • if Ubuntu doesn't have 'em please tell me how to download them
  • And what is the command for viewing standard typedef man page ie man page for size_t, pid_t, off_t, clock_t etc.

I tried man stddef but not found.

1 Answer 1


You need to install the manpages-posix-dev package

sudo apt-get install manpages-posix-dev
man unistd.h

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