[ale] OT: How different is z/OS from Linux/Unix?

[wolf at wolfhalton.info]

It is difficult to get IBM mainframes  to play with, but I want to at
least see z/OS at some point.  I have seen a little of MVS and fellow
list-member Mr Bass has told me about MVS on Linux, which we have messed
with but I (at least) haven't gotten to work.  z/OS is a more recent
development from OS/390 (or is it OS/360?).  Any ideas? 
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