Decided to kick the tires of GnuCOBOL, pushing it a little harder.
Wrote a little more advanced GnuCOBOL simple array program that Uses: REDEFINES, OCCURS, VARYING.
I have previously wrote a few programs to read/write variable and fixed length records.
Variable length records are pretty much regular ascii files (perhaps delimited with a comma) with lines terminated with a line feed on linux.