1 1.1 apb 2 1.2 sjg :D expanded when var set 3 1.2 sjg true,TRUE 4 1.2 sjg :U expanded when var undef 5 1.2 sjg true,TRUE 6 1.2 sjg :D skipped if var undef 7 1.2 sjg 8 1.2 sjg :U skipped when var set 9 1.2 sjg is set 10 1.2 sjg :? only lhs when value true 11 1.2 sjg true,TRUE 12 1.2 sjg :? only rhs when value false 13 1.2 sjg false,FALSE 14 1.1 apb exit status 0 15