determining Tcl patchlevel from the shell

[Massimo Manghi]

admittedly I'm not a great shell programmer. I'm trying to figure out a 
way to determine in a m4 macro which patchlevel of Tcl we are compiling 
Rivet with by letting tclsh return in a shell variable the output of 
[info patchlevel]. We have other examples of Tcl-m4 cooperation but data 
go into files, I would like to get the same information into a shell 
variable, is there a way to do it?

 thanks
 -- Massimo


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