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Your C and C++ skills will likely transfer directly. The other skills you
mention are both rare and unlikely in the Linux world -- JCL is completely
absent, and COBOL, assembler, etc are rare if used at all. Linux does not
use the OS standard linkage conventions, and the syntax (unless you use
commercial tools like Dignus' HLASM port for Linux) is totally different.
REXX is supported, but extremely rare.
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.
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