linux shell之脚本放置多个函数

vi function8.sh
#!/bin/bash

#该函数在一行中显示周一到周日
show_week()
{
for day in Monday Tuesday Wednesday Thursday Friday Saturday Sunday
do
echo -n "$day "
done
}

#该函数在一行中显示1~7
show_number()
{
for((integer = 1; integer <=7; integer++))
do
echo -n "$integer "
done
}

#该函数用于显示1~7的平方
show_square()
{
i=0
until [[ "$i" -gt 7 ]] #通过until实现1~7的平方运算结果输出
do
let "square=i*i"
echo "$i * $i = $square"
let "i++"
done
}

#顺序执行函数
show_week
show_number
show_square

./function8.sh
Monday Tuesday Wednesday Thursday Friday Saturday Sunday 1 2 3 4 5 6 7 0 * 0 = 0
1 * 1 = 1
2 * 2 = 4
3 * 3 = 9
4 * 4 = 16
5 * 5 = 25
6 * 6 = 36
7 * 7 = 49