九九乘法表-bash

#!/bin/env sh

declare -i p z

for ((p=1;p<=9;p++));do
    for ((z=1;z<=p;z++));do
        echo -e "${z}X${p}=$[p*z]\t\c"
    done
    echo
done

echo "############################################################################"

declare -i x=c=1

while [ $x -le 9 ];do
    c=1
    while [ $c -le $x ];do
        echo -e "${c}X${x}=$((x*c))\t\c"
        let c++
    done
    let x++
    echo
done