1281760Ssjg 2292068Ssjg:D expanded when var set 3292068Ssjgtrue 4292068SsjgTRUE 5292068Ssjg:U expanded when var undef 6292068Ssjgtrue 7292068SsjgTRUE 8292068Ssjg:D skipped if var undef 9292068Ssjg 10292068Ssjg:U skipped when var set 11292068Ssjgis set 12292068Ssjg:? only lhs when value true 13292068Ssjgtrue 14292068SsjgTRUE 15292068Ssjg:? only rhs when value false 16292068Ssjgfalse 17292068SsjgFALSE 18292068Ssjgdo not evaluate or expand :? if discarding 19292068Ssjgis set 20281760Ssjgexit status 0 21