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  • (1) Is the ; at the beginning of the command necessary?  Why?  (2) The question explicitly mentions non-interactive logins.  It looks like your answer explicitly fails that requirement.  (3) The question was modified after you posted this to say “you can not assume … that shells other than /bin/sh are available”, so you missed that moving target ex post facto.  … … … … … … … … … … … … … … … … … … … … … …  Don’t feel bad; I’m not sure that the question is answerable, as written. Commented Dec 4, 2017 at 18:48