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/Perhaps for a little more clarity, I should have passed a blank string into comb() from the END clause:

awk '
function comb(v,i) {
for(i in A) {
delete A[i];
if(length(A))
...

As RudiC said, variables that aren't supplied as arguments when an awk function is called are local variables and are initialized to 0 (if used as a number) or to an empty string (if used as a...

They advise not to use them, but the specification also says they have been marked obsolescent and that script should be converted:


test...

awk '{a[$1]=a[$1] FS $2}END{for (i in a) print i,a[i]}' urfile