Shell Programming and Scripting

#!/bin/bash
i="0"
p="."
while [ $i -lt 10 ]
        do
        p="$i $p"
        echo $p
        ((i++))
done

i=0
while [ $i -le 9 ]; do
        j=$i
        while [ $j -ge 0 ]; do
                echo -n "$j "
                (( j-- ));
        done
        echo "."
        ((i++))
done

awk 'BEGIN {a="."; for (i=0;i<=9;i++) {a=i" "a;print a}}'

seq 0 9 | sed '1s/$/ ./; 1!G; y/\n/ /; h'