How to generate strings in Linux incrementing a numeric value?

Question

linux

How to generate strings in Linux by incrementing a numeric value to the desired number?

Input: site.com/images/1

Output txt with data:
site.com/images/1
site.com/images/2
site.com/images/3
site.com/images/4
......

Answer 1

The dumbest option:

for i in `seq 1 4`; do echo "site.com/images/${i}" >>out.txt; done

Answer 2

echo site.com/images/{1..4} | xargs -n1 -P5 wget
where -P5 is the number of simultaneously downloading wget processes

echo site.com/images/{1..4} | xargs -n1 echo > ~/file.txt

save to ~/file.txt.
This code will help you understand how it works:

echo {{001..004},007,{009..011},077,770,1777}
echo {5..6}
echo {{001..004},007,{009..011},077,770,1777}{5..6}