feat: while和util循环

scripts/network/check-subnet.sh

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+#!/bin/bash
+#Program:
+# 扫描子网可达的主机
+#History:
+# 2024/07/14 LouisFonda<yigencong@yahoo.com>
+subnet="192.168.1"
+reachable_hosts=()
+
+# 循环遍历子网中的所有IP地址
+for (( i=1; i<=255; i++ ))
+do
+    ip="$subnet.$i"
+    
+    # 发送单个ICMP回显请求，等待1秒钟，最多发送1次
+    ping -c 1 -W 1 "$ip" > /dev/null 2>&1
+    
+    # 检查ping命令的退出状态
+    if [ $? -eq 0 ]; then
+        echo "$ip 可达"
+        reachable_hosts+=("$ip")
+    fi
+done
+
+echo "可达主机列表："
+echo "${reachable_hosts[@]}"

tutorials/basic/13-function-even.sh

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+#Program:
+# 编写一个函数判断一个数的奇偶性
+#History:
+# 2024/07/14 LouisFonda<yigencong@yahoo.com>
+
+# 函数is_even
+is_even () {
+  test $(expr $1 % 2) -eq 0 && return 0 || return 1
+}
+
+read -p "请输入一个整数：" num
+# 判断这个数是否合法
+if [ "$num" != "" ] && echo "$num" | grep -qE "^-?[0-9]+";then
+  if is_even $num;then
+    echo "这个数是偶数"
+  else 
+    echo "这个数是奇数"
+  fi  
+else
+  echo "输入的数值不和法，请输入整数"
+fi
+

tutorials/basic/14-until-loop.sh

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+#!/bin/bash
+#Program:
+# 判断输入，如果用户输入yes结束循环，否则继续
+#History:
+# 2024/07/14 LouisFonda<yigencong@yahoo.com>
+
+until [ "${yn}" == "yes" -o "${yn}" == "YES" ]
+do
+  read -p "是否结束运行" yn
+done

tutorials/basic/15-while-loop.sh

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+#!/bin/bash
+#Program:
+# 判断输入，如果用户输入yes就继续执行，否则结束运行
+#History:
+# 2024/07/14 LouisFonda<yigencong@yahoo.com>
+
+yn="yes"
+while [ "${yn}" == "yes" -o "${yn}" == "YES" ]
+do
+  read -p "是否继续运行" yn
+done

tutorials/basic/16-nums-total.sh

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+#!/bin/bash
+#Program:
+# 输入一个值，计算从0到这个值的所有和，比如：输入100，那么输出5050
+
+num=0
+sum=0
+
+if [ -n "$1" ] && echo "$1" | grep -Eq "^[-+]?[0-9]+$" && [ "$1" -ge 0 ];then
+  while [ "$num" -le "$1" ]
+  do
+    sum=$(($num+$sum))
+    num=$((num+1))
+  done
+  echo "1-${1}求和的结果为：${sum}"
+else
+  echo "输入的数值不正确，必须为非空且大与等于0的整数"
+fi