Fish

For loop

Iterating over number sequence

for i in (seq 1 10); echo $i; end
Output:

1
2
3
4
5
6
7
8
9
10

If you want all numbers to be padded to equal lengths use the -w flag with seq
for i in (seq -w 1 10); echo $i; end
Output:

01
02
03
04
05
06
07
08
09
10