I wrote a commercial general sort/merge program (still in general
public use) that just reads in a text control file with :-
a) the input file name
b) the second input file name (for merges) or blank
c) the output file name
d) record length in bytes
e) then pretty much as many fields as you want, coded as
type,bytestart,bytelength,A/D [,and repeat]
You can also request a tag sort, where the file byte offeset addresses
Of course it can't deal with arbitary fields beyond the expected
I always prefer simple and practical.
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