$ sudo awk 'NR%2==1{close(p".txt");++p}{print > p".txt"}' test.txt $ sudo split -d -l 2 test.txt new ...
$ sudo awk 'NR%2==1{close(p".txt");++p}{print > p".txt"}' test.txt
$ sudo split -d -l 2 test.txt new
$ sudo awk 'NR%2==1{close(p".txt");++p}{print > p".txt"}' test.txt $ sudo split -d -l 2 test.txt new ...
$ sudo awk 'NR%2==1{close(p".txt");++p}{print > p".txt"}' test.txt
$ sudo split -d -l 2 test.txt new