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

                   *

                *  *

             *  *  *

          *  *  *  *

       *  *  *  *  *

    *  *  *  *  *  *

 *  *  *  *  *  *  *