Running some experiment on a VM server I rapidly ran out of patience
having to wait for commands to run, and/or switching back and forth
using Ctrl+Z, bg, and fg. My thoughts went back to Nick Black who had
introduced me to Gnu Screen several years back, alas I has forgotten the
short-cuts, Thankfully Google and the man page came to the rescue.
Since the VM server was a CentOS 6.
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