#!/bin/sh
for i in $(seq 10); do
	echo $i
done

Outputs:

1
2
3
4
5
6
7
8
9
10

#!/bin/sh
for i in $(seq 5 10); do
	echo $i
done

Outputs:

5
6
7
8
9
10

#!/bin/sh
for i in $(seq 5  -1 0); do
	echo $i
done

Outputs:

5
4
3
2
1
0