Sorry to say, but other than your C and C++ programming skills, little or none of what you do today will transfer over. That said, porting applications is a growing market and few, if any, Linux-trained programmers understand the concepts of the mainframe world, so knowing what *used* to be there is likely to be a selling point, if you can work out a good set of replacements, eg, JCL -> Perl scripts, REXX -> Perl, etc.
Dig Deeper on IBM system z and mainframe systems
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