diff --git a/port.sh b/port.sh
index 8fb4163..f75eb25 100644
--- a/port.sh
+++ b/port.sh
@@ -1,3 +1,19 @@
+#!/bin/sh
+# 安装脚本 - POSIX sh 兼容
+# Alpine 下自动安装 bash 和 openrc
+if [ -f /etc/alpine-release ]; then
+    if ! command -v bash > /dev/null 2>&1; then
+        echo "Alpine 系统检测到，正在安装 bash..."
+        apk add --no-cache bash
+    fi
+    if ! command -v rc-service > /dev/null 2>&1; then
+        echo "正在安装 OpenRC..."
+        apk add --no-cache openrc
+        mkdir -p /run/openrc
+        touch /run/openrc/softlevel
+    fi
+fi
+
 cat > /root/port-forward.sh << 'EOF'
 #!/bin/bash
 
@@ -28,13 +44,25 @@ detect_system() {
         OS="unknown"
     fi
 
-    if command -v systemctl &> /dev/null && systemctl --version &> /dev/null 2>&1; then
+    if command -v systemctl > /dev/null 2>&1 && systemctl --version > /dev/null 2>&1; then
         INIT_SYS="systemd"
-    elif command -v rc-service &> /dev/null; then
+    elif command -v rc-service > /dev/null 2>&1; then
         INIT_SYS="openrc"
     else
-        echo -e "${RED}错误: 不支持的初始化系统（需要 systemd 或 OpenRC）${NC}"
-        exit 1
+        # Alpine 下尝试自动安装 OpenRC
+        if [ "$OS" = "alpine" ]; then
+            echo -e "${YELLOW}OpenRC 未安装，正在安装...${NC}"
+            apk add --no-cache openrc
+            mkdir -p /run/openrc
+            touch /run/openrc/softlevel
+            if command -v rc-service > /dev/null 2>&1; then
+                INIT_SYS="openrc"
+            fi
+        fi
+        if [ -z "$INIT_SYS" ]; then
+            echo -e "${RED}错误: 不支持的初始化系统（需要 systemd 或 OpenRC）${NC}"
+            exit 1
+        fi
     fi
 
     echo -e "${BLUE}系统: ${OS} | 初始化系统: ${INIT_SYS}${NC}"
@@ -47,13 +75,13 @@ detect_system() {
 check_deps() {
     # Alpine 下确保 bash 已安装
     if [ "$OS" = "alpine" ]; then
-        if ! command -v bash &> /dev/null; then
+        if ! command -v bash > /dev/null 2>&1; then
             echo -e "${YELLOW}bash 未安装，正在安装...${NC}"
             apk add --no-cache bash
         fi
     fi
 
-    if ! command -v socat &> /dev/null; then
+    if ! command -v socat > /dev/null 2>&1; then
         echo -e "${YELLOW}socat 未安装，正在安装...${NC}"
         if [ "$OS" = "alpine" ]; then
             apk add --no-cache socat
@@ -853,6 +881,16 @@ main_menu() {
     done
 }
 
+# 确保使用 bash 执行
+if [ -z "$BASH_VERSION" ]; then
+    if command -v bash > /dev/null 2>&1; then
+        exec bash "$0" "$@"
+    else
+        echo "错误: 需要 bash 来运行此脚本"
+        exit 1
+    fi
+fi
+
 if [[ $EUID -ne 0 ]]; then
    echo -e "${RED}此脚本必须以 root 权限运行${NC}"
    exit 1