Linux Shell Programming print shape

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Print triangle

topic:

Shell write a program to print a (long asterisk on behalf of a unit of a side) by the "*" is composed of an equilateral triangle side length of the upright 8.

#/bin/bash
length=8
for ((i=1; i<=$length; i++))
do
	for ((j=1; j<=$length-i; j++))
	do
		echo -n  " "
	done
	for ((x=1; x<=i; x++))
	do
		echo -n  "* "
	done
	echo ""
done