[Modules] How to detect the current Linux distribution?

[Frank T. <f.t...@dk...>]

Hi,

I am currently trying to generalize our modulefiles so that the same 
file can be used for different Linux distros.  For historical reasons, 
openSuSE and CentOS hosts @work have different base paths of their 
respective software stack.

Therefore my question: Is there a simple Tcl command that allows me to 
detect the current Linux distribution or how could I detect it 
otherwise?  I can do it with bash, but I have no knowledge of Tcl other 
than our very basic and simple modulefiles.

Any hint is appreciated.

Cheers
frank