ref: 7d562f0dff4db4ea7f7e91f462c4adf552b1b410 dir: /testdir/t.set0/
{$0 = $1; print; print NF, $0; print $2} {$(0) = $1; print; print NF, $0; print $2} { i = 1; $(i) = $i+1; print }