『BASH』

一、构显９９乘法表

#!/usr/bin/env bash
test() {
for((i=1;i<10;i++))
do
    for((x=1;x<=$i;x++))
    do
        echo -n "$x x $i = $(($i * $x))    "
    done
    echo -e "\n"
done
}
test | gawk 'BEGIN{RS=""}{print}'

f@z ~/bash_script/2016-08-16 $ bash 99.sh 
1 x 1 = 1	
1 x 2 = 2	2 x 2 = 4	
1 x 3 = 3	2 x 3 = 6	3 x 3 = 9	
1 x 4 = 4	2 x 4 = 8	3 x 4 = 12	4 x 4 = 16	
1 x 5 = 5	2 x 5 = 10	3 x 5 = 15	4 x 5 = 20	5 x 5 = 25	
1 x 6 = 6	2 x 6 = 12	3 x 6 = 18	4 x 6 = 24	5 x 6 = 30	6 x 6 = 36	
1 x 7 = 7	2 x 7 = 14	3 x 7 = 21	4 x 7 = 28	5 x 7 = 35	6 x 7 = 42	7 x 7 = 49	
1 x 8 = 8	2 x 8 = 16	3 x 8 = 24	4 x 8 = 32	5 x 8 = 40	6 x 8 = 48	7 x 8 = 56	8 x 8 = 64	
1 x 9 = 9	2 x 9 = 18	3 x 9 = 27	4 x 9 = 36	5 x 9 = 45	6 x 9 = 54	7 x 9 = 63	8 x 9 = 72	9 x 9 = 81	

二、构显国际象棋８*８棋盘

#!/bin/bash
line_0() {
for i in {0..47}
do
    if [[ $(($(($i / 8))  % 2)) == "0" ]]
    then
        echo -ne "\033[41m \033[00m"
    else
        echo -ne "\033[46m \033[00m"
    fi
done
}
line_1() {
        for i in {0..47}
        do
            if [[ $(($(($i / 8))  % 2)) != "0" ]]
            then
                echo -ne "\033[41m \033[00m"
            else
                echo -ne "\033[46m \033[00m"
            fi
        done
}
chess() {
for x in {0..23}
do
    if [[ $(($(($x / 4)) % 2)) != "0" ]]
    then
        line_0
    else
        line_1
    fi
    echo -e "\n"
done
}
chess | gawk 'BEGIN{RS=""}{print}'

#!/usr/bin/bash
n=1
test() {
    for x in {1..8}
    do
    if [[ $(($x % 2)) == "0" ]]
    then
        echo -e "\033[41m  \033[00m"
    else
        echo -e "\033[46m  \033[00m"
    fi
    done
}
while [[ $n < 9 ]]
do
    if [[ $(($n % 2)) == "0" ]]
    then
        test > $n.txt
    else
        test | tac > $n.txt
    fi
let n+=1
done
paste {1..8}.txt > result.txt
cat result.txt | sed 's/\t//g'
rm result.txt {1..8}.txt

三、取１０个随机数中的最大值和最小值

#!/usr/bin/env bash
max=$RANDOM
min=$max
echo $max
for((i=9;i>0;i--))
do
    max_old=$max
    max=$RANDOM
    echo $max
    if [[ $max -lt $max_old ]]
    then
        min_old=$min
        min=$max
        if [[ $min -gt $min_old ]]
        then
            min=$min_old
        fi
        max=$max_old
    fi
done
echo -e "\nLargest: $max; smallest: $min"

f@z ~/bash_script/2016-08-16 $ bash max_min.sh 
5677
28252
27333
13922
3719
22836
2412
6102
3560
12516

Largest: 28252; smallest: 2412

四、求１－１００整数之和

#!/usr/bin/bash
read -p "Please input an +int: " N
sumN=0
for((i=1;i<=$N;i++))
do
    sumN=$(($sumN + $i))
done
echo "$sumN"