diff --git a/day1/d22.sh b/day1/d22.sh
new file mode 100644
index 0000000..9b51f6d
--- /dev/null
+++ b/day1/d22.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+echo "please input y/n"
+read yn
+
+case $yn in
+    # | 表示或的意思
+    y|Y|yes|Yes|YES)
+        echo "your input yes ..."
+        ;;
+    n)
+        echo "your input no ..."
+        ;;
+    *)
+        echo "your input is invalid argument"
+        exit 1
+esac
+
+# if [ "$yn" = "y" ]; then
+#     echo "your input yes ..."
+# elif [ "$yn" = "n" ]
+# then
+#     echo "your input no ..."
+# else
+#     echo "your input is invalid argument"
+# fi
\ No newline at end of file
diff --git a/day1/d23.sh b/day1/d23.sh
new file mode 100644
index 0000000..296604b
--- /dev/null
+++ b/day1/d23.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# declare 是 Bash 内置命令，用于声明变量的属性，包括类型、作用域和初始值等。    
+declare -i total=0
+
+for (( i=5;i<=100;i++ )); do
+    if  (( i%5 == 0 )); then
+        total+=i
+    fi
+done
+
+echo "$total"
\ No newline at end of file
diff --git a/day1/d24.sh b/day1/d24.sh
new file mode 100644
index 0000000..e091f33
--- /dev/null
+++ b/day1/d24.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+declare -i n
+read -p "请输入一个整数: " n
+
+for (( i=2; i<n; i++ )); do
+    if (( n%i == 0)); then
+        echo "$n 不是素数"
+        exit 1
+    fi
+done
+echo "$n 是素数"
+
+echo "$n"
\ No newline at end of file
diff --git a/day1/d25.sh b/day1/d25.sh
new file mode 100644
index 0000000..3774459
--- /dev/null
+++ b/day1/d25.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+declare -i total=0
+
+for line in `ls *.sh`
+do
+    total+=`ls -l $line | awk '{print $5}'`
+done
+
+echo "所有 sh 文件的总大小为: $total 字节"
\ No newline at end of file
diff --git a/day1/d26.sh b/day1/d26.sh
new file mode 100644
index 0000000..00a085c
--- /dev/null
+++ b/day1/d26.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+echo "请输入内容，exit退出: "
+read -p ">" cmd
+while [ $cmd != "exit" ]; do
+    echo "$cmd"
+    read -p ">" cmd
+done
\ No newline at end of file
diff --git a/day1/d27.sh b/day1/d27.sh
new file mode 100644
index 0000000..8e1c106
--- /dev/null
+++ b/day1/d27.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+echo "请输入内容，exit退出: "
+read -p ">" cmd
+until [ $cmd == "exit" ]; do
+    echo "$cmd"
+    read -p ">" cmd
+done
\ No newline at end of file
diff --git a/day1/d28.sh b/day1/d28.sh
new file mode 100644
index 0000000..fe22b46
--- /dev/null
+++ b/day1/d28.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+declare -i ret=1
+declare -i n
+read -p "整数: " n
+until [ $n -eq 1 ]; do
+    ret=ret*n
+    n=n-1
+done
+echo "$ret"
diff --git a/day1/d29.sh b/day1/d29.sh
new file mode 100644
index 0000000..577e694
--- /dev/null
+++ b/day1/d29.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+function isZs()
+{
+    declare -i n
+    n=$1
+    for(( i=2; i<n; i++ )); do
+        if (( n%i == 0 )); then
+            return 1
+        fi
+    done
+    return 0
+}
+
+isZs $1
+if [[ $? -eq 0 ]] ; then
+    echo "$1 是素数"
+fi
\ No newline at end of file