shell 10流程控制
发布时间:2020-12-15 23:20:51 所属栏目:安全 来源:网络整理
导读:if 判断 if #shell#!/bin/sha=5if [[ $a 3 ]];then echo "$a3"fi#写成一行if [[ $a 6 ]];then echo "$a3";fi 53 53 if else #shell#!/bin/sha=5if [[ $a 8 ]];then echo "$a8"else echo "$a8"fi 58 if elif else #shell#!/bin/sha=5if [[ $a 5 ]];then echo
if 判断if#shell #!/bin/sh a=5 if [[ $a > 3 ]];then echo "$a>3" fi #写成一行 if [[ $a < 6 ]];then echo "$a>3";fi 5>3 if else#shell #!/bin/sh a=5 if [[ $a > 8 ]];then echo "$a>8" else echo "$a<8" fi 5<8 if elif else#shell #!/bin/sh a=5 if [[ $a > 5 ]];then echo "$a>5" elif [ $a -eq 5 ];then echo "$a=5" else echo "$a<5" fi 5=5 for循环#shell #!/bin/sh for i in `seq 1 5`;do echo $i done 1 while语句#shell a=1 while [ $a -lt 5 ];do echo "$a" let "a++" #或者 a=`expr $a + 1` done 1 无限循环while中用:代替条件#shell #!/bin/sh while : ;do echo "hello" done while 条件一直为true#shell #!/bin/sh while true;do echo "hello" done 使用for循环#!/bin/sh for ((;;));do echo "hello" done until 循环#shell #!/bin/sh a=0 until [ $a -gt 10 ]; do echo $a let "a++" done 0 case为多选语句,每个case语句匹配一个值与一个模式#shell #!/bin/sh read -p "请输入的你的名次:" num case $num in 1) echo "武林盟主" ;; 2) echo "五岳盟主" ;; 3) echo "华山掌门" ;; *) echo "回家玩去" esac 跳出循环break跳出所有循环#shell while :;do read -p "请输入1到5之间的数字:" num case $num in 1|2|3|4|5) echo "你输入的数字为$num" ;; *) echo "你输入的数字不在1和5之间" break ;; esac done 输入6后停止循环 continue跳出本次循环#shell while :;do read -p "请输入1到5之间的数字:" num case $num in 1|2|3|4|5) echo "你输入的数字为$num" ;; *) echo "你输入的数字不在1和5之间" continue echo "游戏结束" ;; esac done 输入7后继续下次循环 esac case用easc结束,每个case分枝用 ;;来break(编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |