This package uses the (La)TeX extension -shell-escape to establish whether the document is being processed on a Windows or on a Unix-like system (Mac OS X, Linux, etc.), or on Cygwin (Unix environment over a windows system).

Booleans provided are:

• \ifwindows,
• \iflinux,
• \ifmacosx and
• \ifcygwin.

The package also preserves the output of uname on a Unix-like system, which may be used to distinguish between various classes of Unix systems.

The authors are Will Robertson and Johannes Große. The package is Copyright © 2007-2010 Will Robertson and Johannes Große.