Shell Script to print pyramid

Program

#W.A.S.S. to create pyramid

echo -e "enter num:\c"

read n

j=1

k=1

while test $k -le $n          #this loop print as many * per line as the value of j

do

  j=$k

  while test $j -lt $n         #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

       *
      *  *
     *  *  *
    *  *  *  *
   *  *  *  *  *
  *  *  *  *  *  *
 *  *  *  *  *  *  *