Can anyone explain what is nginx.old?

[Valentin V. Bartenev]

On Sunday 13 November 2011 10:58:39 Ilan Berkner wrote:
> I'm seeing some warnings in root log files regarding excessive processes
> for nginx.old...

When you do "make install" to some destination directory, and installation script 
finds out that there is an old "nginx" binary, then it renames the old binary to 
the "nginx.old", before copying the new one.

wbr, Valentin V. Bartenev