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help in display a sequence of number

I am doing a exercise for using for and while loop to perform from tw0 any variable by using command seq; but it is used for increasable number such as: 3 to 15 or 1 to 10..i was wonder like how about to perform from 15 to 3 or from 10 to 1; such as: using first and last flags...Plz help me to tide off this complex...Thanks for reading

Code:

seq 15 -1 3

In man seq you see:

Quote:

seq [OPTION]... FIRST INCREMENT LAST

So if 'first' is 15, 'increment' is -1 and 'last' is 3 you get:

Code:

for x in $(seq 15 -1 3); do echo $x; done

likewise 10 to 1:

Code:

for x in $(seq 10 -1 1); do echo $x; done

Or if you're using bash and you want to decrease one at a time, you can use extended brace expansion:

Code:

for x in {15..1}; do echo $x; done

The advantage of using 'seq' is that you can decrement by a value other than one. For instance here we go from 15 to 3 in decrements of 5:

Code:

for x in $(seq 15 -5 3); do echo $x; done

thanks a lot guys...It got a very quick and nice lesson for my first step to bash script..thanks and cheers