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$ a=foo b=bar; export a b; perl -le 'exists $ENV{a} && exists $ENV{b} 
+? exit 0 : exit 1' && echo 'success'
success

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$ a=foo b=bar; export a b; perl -le 'exists $ENV{a} && exists $ENV{b} 
+? exit 0 : exit 1'; echo "exit status: $?"
exit status: 0