I clicked the thanks button to El Presidente for this, which has all worked a treat. Only one peculiarity when I did it - which may have been picked up already...I haven't read all the messages above. That was that the command 'Exit' - which I carefully put in with an initial capital in view of the earlier strictures, produced a 'permission denied' response. Changing it to 'exit' got me out... Phew...!
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