Right triangle
Program
#W.A.S.S. to create right triangle
echo -e "enter num:\c"
read n
j=1
k=1
while test $k -le $n #this loop print as many line of * as the value of k
do
j=`expr $n - $k`
while test $j -gt 0 #this loop print forward spaces in each line
do
echo -e " \c"
j=`expr $j - 1`
done
j=1
while test $j -le $k #this loop print as many * per line as the value of j
do
echo -e " * \c"
j=`expr $j + 1`
done
echo " "
k=`expr $k + 1`
done
Output
enter num:7
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *