Shell脚本——for,while,until循环
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1、for循环:
语句格式:
for i in 循环判断
do
循环体
done
举例:九九乘法表(for循环版本)
#!/bin/bash # Author: Sean Martin # Blog: https://www.cnblogs.com/shy13138/ # Time: 2019-08-16 10:35:48 # Name: 99for.sh # Version: v1.0 for i in 1..9;do for j in $(seq $i);do echo -ne "$i*$j=$((i*j)) " done echo ‘‘ done
2、while循环
语句格式:
while 循环判断
do
循环体
done
举例:猜拳游戏
#!/bin/bash # Author: Sean Martin # Blog: https://www.cnblogs.com/shy13138/ # Time: 2019-08-16 10:35:48 # Name: caiquan.sh # Version: v1.0 j=1 while [ $j -le 5 ] do echo "1.石头 2.剪刀 3.布 " read -p "请出拳1-3:" i if [ $i -ne 1 -o $i -ne 2 -o $i -ne 3 ];then echo "请输入1-3之间的数" fi game=(石头 剪刀 布) num=$((RANDOM%3)) echo computer=$game[$num] case $i in 1) if [ 0 -eq $num ];then echo "平局" elif [ 1 -eq $num ];then echo "你输了" else echo "你赢了" fi;; 2) if [ 1 -eq $num ];then echo "平局" elif [ 0 -eq $num ];then echo "你输了" else echo "你赢了" fi;; 3) if [ 2 -eq $num ];then echo "平局" elif [ 1 -eq $num ];then echo "你输了" else echo "你赢了" fi;; esac let j++ done
3、until循环
until循环与while循环类似
语句格式:
until 循环判断
do
循环体
done
举例:
99乘法表(until版)
#!/bin/bash # Author: Sean Martin # Blog: https://www.cnblogs.com/shy13138/ # Time: 2019-08-16 10:35:48 # Name: 99until.sh # Version: v1.0 i=1 until [[ $i -gt 9 ]] do j=1 until [[ $j -gt $i ]] do let "sum = $i*$j" echo -n -e "$i*$j=$sum\\t" let "j++" done echo "" let "i++" done
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