How do I convert GrCh37 text files to a map file?

Question

[LTDavid]

How do I go from the multiple GrCh37 text files separated by chromosome to a single map file that I can use in IBD estimation?

I have the following information about the map argument: map=[file] specifies a PLINK format genetic map with cM units. HapMap GrCh36 and GrCh37 genetic maps in PLINK format are available for download from the Refined IBD web site. Refined IBD will use linear interpolation to estimate genetic positions between map positions.

download website: http://bochet.gcc.biostat.washington.edu/beagle/genetic_maps/