ref: e6dff2afe66a7aea90440fe000f6b2f7513f1888 dir: /test/t.split4/
{ a = $0 " " $0 " " $0 " " 123 n = split (a, x, /[ \t][ \t]*/) print n, x[1], x[2], x[3], x[4] }