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merge.pl file_1 a,b,c file_2 d,e,f

#DFD ' '
#H Period Interface SrcRouter Subset MbitsCap Polls MbpsIn 
...
%9.5f %14s %7.3f %7.3f %7.3f %7.3f %7.3f %9.5f %14s %3s %7.3f 
%7.3f %7.3f %7.3f %7.3f %7.3f %7.3f %7.3f %10d %7d %7d %7d %7d 
%7.3f %7.3f %-10s %14.3f %14.3f %-30s %-10s

create a hash whose keys are any of the headers specified on the 
command line. Each key value is a reference to an array containing 
the data from each column.

create another hash whose keys are any of the headers specified 
on the command line. Each key value is a reference to an array 
containing the data from each column.

the column "SrcRtr" from file_1 contains the exact same data as the 
column "DstDev" in file_2