La commande seq permet l'affichage d'une séquence de nombres.
seq
printf
root@ubuntu:~# for HH in $(seq -f %02g 0 5) do for MM in $(seq -f %02g 0 59) do for SS in $(seq -f %02g 0 59) do echo $HH:$MM:$SS done done done 00:00:00 00:00:01 00:00:02 00:00:03 00:00:04 00:00:05 00:00:06 00:00:07 00:00:08 ...
root@ubuntu:~# seq -f %03g 0 2 18 000 002 004 006 008 010 012 014 016 018
root@ubuntu:~# seq -f %02g 10 -1 1 10 09 08 07 06 05 04 03 02 01