github.com/benhoyt/goawk@v1.8.1/testdata/p.51 (about)

     1  BEGIN	{ FS = ":" }
     2  {	if ($1 != prev) {
     3  		print "\n" $1 ":"
     4  		prev = $1
     5  	}
     6  	printf "\t%-10s %6d\n", $2, $3
     7  }