In Epistula a Klaus Heinz, die horaque Sun, 09 Mar 2003, 15:21:25 +0100, has legenda erat:
> Hi,
> 
> is /var/run/ available for creation of .pid files on all supported
> platforms?
> I know OpenBSD, FreeBSD and Solaris have it,  MacOS X/Darwin probably as
> well, but what about the various Linux flavours and IRIX? HP-UX and
> Tru64?

Linux: most probably yes, I have not yet found a distro without.
	It is also denoted in the file system hierarchy standard (fhs):
	http://www.pathname.com/fhs/2.2/fhs-5.13.html
HPUX: yes

btw: is this standardised somewhere?

Peter