feat: while和util循环

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