These files allow you to easily consult the POSIX documentation for man sections 1 and 3. It also contains a "section 0" for header files.

It contains Issue 6 (POSIX.1-2001) and Issue 7 (POSIX.1-2008).

Pressing K in vim brings up the man page for the word under the cursor. In fact, nK bring up section n. Sadly 0K does not work, so section 0 is inaccessible through Vim.

The man pages in the upstream Debian package use sections 0P, 1P, and 3P, which would be incompatible with vim, so I changed them to plain numbers.

To point Vim to the POSIX man pages, do this:

git clone https://github.com/begriffs/posix-man

Then in your vim configuration (like an ftplugin for c and sh files):

setlocal keywordprg=man\ -M\ /path/to/posix-man/issue7

The irony is not lost on me that -M or MANPATH is not supported by POSIX's own man interface.

June Bug's exman program allows you to consult multiple sets of man pages on the same system. This didn't exactly fit the bill for me because I wanted to remove the P from sections, and also wanted to strip the Linux preamble from the POSIX pages.