diff --git a/install.sh b/install.sh
index 5af7a981..26e55653 100644
--- a/install.sh
+++ b/install.sh
@@ -1,99 +1,22 @@
-#!/usr/bin/env bash
+#!/bin/sh
 # Copyright (C) Juewuy
 
-# ================================= table format tools =================================
-# >>>>>>>>>>>>>>
+echo "***********************************************"
+echo "**                 欢迎使用                  **"
+echo "**                ShellCrash                 **"
+echo "**                             by  Juewuy    **"
+echo "***********************************************"
 
-# set the total width of the menu
-# (adjusting this number will automatically change the entire menu, including the separator lines)
-# note: The number represents the number of columns that appear when the "||" appears on the right
-TABLE_WIDTH=60
+[ -z "$url" ] && url="https://testingcf.jsdelivr.net/gh/juewuy/ShellCrash@master"
 
-# define two extra-long template strings in advance
-# (the length should be greater than the expected TABLE_WIDTH)
-FULL_EQ="===================================================================================================="
-FULL_DASH="- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "
-
-# function to print content lines
-# (using cursor jump)
-content_line() {
-    echo -e " ${1}\033[${TABLE_WIDTH}G||"
+# 内置工具
+cecho() {
+    printf '%b\n' "$*"
 }
-
-# function to print sub content lines
-# for printing accompanying instructions
-sub_content_line() {
-    echo -e "    ${1}\033[${TABLE_WIDTH}G||"
-    content_line
-}
-
-# increase the spacing between the front
-# and back forms to improve readability
-double_line_break() {
-    printf "\n\n"
-}
-
-# function to print separators
-# (using string slicing)
-# parameter $1: pass in "=" or "-"
-separator_line() {
-    local separator_type="$1"
-    local output_line=""
-    local len=$((TABLE_WIDTH - 1))
-
-    if [ "$separator_type" == "=" ]; then
-        output_line="${FULL_EQ:0:$len}"
-    else
-        output_line="${FULL_DASH:0:$len}"
-    fi
-
-    echo "${output_line}||"
-}
-# <<<<<<<<<<<<<<
-# ================================= table format tools =================================
-
-# =============================== display prompt message ===============================
-# >>>>>>>>>>>>>>
-
-abort_install() {
-    double_line_break
-    separator_line "="
-    content_line "安装已取消"
-    separator_line "="
-    double_line_break
-
-    exit 1
-}
-
-invalid_input_retry() {
-    double_line_break
-    separator_line "="
-    content_line "\033[31m输入错误！\033[0m"
-    content_line "\033[31m请重新设置！\033[0m"
-    separator_line "="
-
-    sleep 1
-}
-
-# <<<<<<<<<<<<<<
-# =============================== display prompt message ===============================
-
-[ -z "$url" ] && url="https://testingcf.jsdelivr.net/gh/juewuy/ShellCrash@dev"
-type bash &>/dev/null && shtype=bash || shtype=sh
-
-error_down() {
-    content_line "\033[33m请参考：\033[0m"
-    content_line "\033[33mgithub.com/juewuy/ShellCrash/blob/master/README_CN.md\033[0m"
-    content_line "\033[33m或使用其他安装源重新安装！\033[0m"
-}
-
-# check available capacity
 dir_avail() {
     df -h >/dev/null 2>&1 && h="$2"
-    df -P $h "${1:-.}" 2>/dev/null | awk 'NR==2 {print $4}'
+	df -P $h "${1:-.}" 2>/dev/null | awk 'NR==2 {print $4}'
 }
-
-# 检查命令
 ckcmd() {
     if command -v sh >/dev/null 2>&1; then
         command -v "$1" >/dev/null 2>&1
@@ -101,7 +24,6 @@ ckcmd() {
         type "$1" >/dev/null 2>&1
     fi
 }
-
 webget() {
     #参数【$1】代表下载目录，【$2】代表在线地址
     #参数【$3】代表输出显示，【$4】不启用重定向
@@ -109,17 +31,7 @@ webget() {
         [ "$3" = "echooff" ] && progress='-s' || progress='-#'
         [ -z "$4" ] && redirect='-L' || redirect=''
         result=$(curl -w %{http_code} --connect-timeout 5 "$progress" "$redirect" -ko "$1" "$2")
-
-        # === original version ===
-        # [ -n "$(echo $result | grep -e ^2)" ] && result="200"
-
-        # === fixed version ===
-        # strictly match the 200 status code to avoid 204 (empty content)
-        # or 202 being mistakenly interpreted as success
-        if [ "$result" = "200" ]; then
-            result="200"
-        fi
-
+        [ -n "$(echo $result | grep -e ^2)" ] && result="200"
     else
         if wget --version >/dev/null 2>&1; then
             [ "$3" = "echooff" ] && progress='-q' || progress='-q --show-progress'
@@ -133,22 +45,28 @@ webget() {
         [ $? -eq 0 ] && result="200"
     fi
 }
+error_down() {
+    cecho "请参考 \033[32mhttps://github.com/juewuy/ShellCrash/blob/master/README_CN.md"
+    cecho "\033[33m使用其他安装源重新安装！\033[0m"
+}
 
 # 安装及初始化
 set_alias() {
     while true; do
-        double_line_break
-        separator_line "="
-        content_line "\033[36m请选择一个别名\033[0m"
-        content_line "\033[36m或直接输入自定义别名\033[0m"
-        separator_line "-"
-        content_line "1) 【\033[32mcrash\033[0m】"
-        content_line "2) 【\033[32m sc  \033[0m】"
-        content_line "3) 【\033[32m mm  \033[0m】"
-        content_line "E) 退出安装"
-        separator_line "="
-        read -p "请输入相应数字/自定义别名> " res
+        echo "-----------------------------------------------"
+        cecho "\033[36m请选择一个别名，或使用自定义别名：\033[0m"
+        echo "-----------------------------------------------"
+        cecho " 1 【\033[32mcrash\033[0m】"
+        cecho " 2 【\033[32m sc \033[0m】"
+        cecho " 3 【\033[32m mm \033[0m】"
+        cecho " 0 退出安装"
+        echo "-----------------------------------------------"
+        read -p "请输入相应数字或自定义别名 > " res
         case "$res" in
+        0)
+            echo "安装已取消"
+            exit 1
+            ;;
         1)
             my_alias=crash
             ;;
@@ -158,581 +76,298 @@ set_alias() {
         3)
             my_alias=mm
             ;;
-        "E" | "e")
-            abort_install
-            ;;
         *)
             my_alias=$res
             ;;
         esac
         cmd=$(ckcmd "$my_alias" | grep 'menu.sh')
         ckcmd "$my_alias" && [ -z "$cmd" ] && {
-            double_line_break
-            separator_line "="
-            content_line "该别名【\033[32m$my_alias\033[0m】和当前系统内置命令／别名\033[33m冲突\033[0m，请更换"
-            separator_line "="
-
+            cecho "\033[33m此别名和当前系统内置命令/别名冲突，请换一个！\033[0m"
             sleep 1
             continue
         }
-        break 1
+        break
     done
 }
-
 gettar() {
     webget /tmp/ShellCrash.tar.gz "$url/ShellCrash.tar.gz" >/dev/null 2>&1
     if [ "$result" != "200" ]; then
-        content_line "\033[31m下载失败！\033[0m"
+        cecho "\033[33m文件下载失败！\033[0m"
         error_down
-        separator_line "="
-        double_line_break
         exit 1
     else
-        content_line "下载成功"
         "$CRASHDIR"/start.sh stop 2>/dev/null
         # 解压
-        content_line "开始解压文件......"
+        echo "-----------------------------------------------"
+        echo "开始解压文件！"
         mkdir -p "$CRASHDIR" >/dev/null
         tar -zxf '/tmp/ShellCrash.tar.gz' -C "$CRASHDIR"/ || tar -zxf '/tmp/ShellCrash.tar.gz' --no-same-owner -C "$CRASHDIR"/
         if [ -s "$CRASHDIR"/init.sh ]; then
-            content_line "解压成功"
-            separator_line "="
             set_alias
-            . $CRASHDIR/init.sh >/dev/null
-            if [ $? != 0 ]; then
-                content_line "\033[31m初始化失败，请尝试本地安装！\033[0m"
-                separator_line "="
-                double_line_break
-
-                exit 1
-            fi
-
+            . "$CRASHDIR"/init.sh >/dev/null
+            [ "$?" != 0 ] && cecho "\033[33m初始化失败，请尝试本地安装！\033[0m" && exit 1
         else
             rm -rf /tmp/ShellCrash.tar.gz
-            content_line "\033[31m解压失败！\033[0m"
+            cecho "\033[33m文件解压失败！\033[0m"
             error_down
-            separator_line "="
-            double_line_break
-
             exit 1
         fi
     fi
 }
-
 set_usb_dir() {
     while true; do
-        double_line_break
-        separator_line "="
-        content_line "请选择安装目录："
-        separator_line "-"
-
-        # original version
-        # du -hL /mnt | awk '{print " "NR" "$2"  "$1}'
-        du -hL /mnt |
-            awk '{print NR") "$2"    （已用空间："$1"）"}' |
-            while IFS= read -r line; do
-                content_line "$line"
-            done
-
-        content_line "0) 返回上级菜单"
-        separator_line "="
-        read -p "请输入相应数字> " num
-        case "$num" in
-        0)
-            return 1
-            ;;
-        *)
-            dir=$(du -hL /mnt | awk '{print $2}' | sed -n "$num"p)
-            if [ -z "$dir" ]; then
-                invalid_input_retry
-                continue
-            fi
-            return 0
-            ;;
-        esac
+        cecho "请选择安装目录"
+        du -hL /mnt | awk '{print " "NR" "$2"  "$1}'
+        read -p "请输入相应数字 > " num
+        dir=$(du -hL /mnt | awk '{print $2}' | sed -n "$num"p)
+        if [ -z "$dir" ]; then
+            cecho "\033[31m输入错误！请重新设置！\033[0m"
+            continue
+        fi
+        break 1
     done
 }
-
+set_xiaomi_dir() {
+	cecho "\033[33m检测到当前设备为小米官方系统，请选择安装位置\033[0m"
+	[ -d /data ] && cecho " 1 安装到 /data 目录,剩余空间：$(dir_avail /data -h)(支持软固化功能)"
+	[ -d /userdisk ] && cecho " 2 安装到 /userdisk 目录,剩余空间：$(dir_avail /userdisk -h)(支持软固化功能)"
+	[ -d /data/other_vol ] && cecho " 3 安装到 /data/other_vol 目录,剩余空间：$(dir_avail /data/other_vol -h)(支持软固化功能)"
+	cecho " 4 安装到自定义目录(不推荐，不明勿用！)"
+	cecho " 0 退出安装"
+	echo "-----------------------------------------------"
+	read -p "请输入相应数字 > " num
+	case "$num" in
+	1)
+		dir=/data
+		;;
+	2)
+		dir=/userdisk
+		;;
+	3)
+		dir=/data/other_vol
+		;;
+	4)
+		set_cust_dir
+		;;
+	*)
+		exit 1
+		;;
+	esac
+}
+set_asus_usb() {
+	while true; do
+		echo -e "请选择U盘目录"
+		du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print " "NR" "$2"  "$1}'
+		read -p "请输入相应数字 > " num
+		dir=$(du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print $2}' | sed -n "$num"p)
+		if [ ! -f "$dir/asusware.arm/etc/init.d/S50downloadmaster" ]; then
+			echo -e "\033[31m未找到下载大师自启文件：$dir/asusware.arm/etc/init.d/S50downloadmaster，请检查设置！\033[0m"
+			sleep 1
+		else
+			break
+		fi
+	done
+}
 set_asus_dir() {
-    while true; do
-        double_line_break
-        separator_line "="
-        content_line "请选择U盘目录："
-        separator_line "-"
-
-        # original version
-        # du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print " "NR" "$2"  "$1}'
-        du -hL /tmp/mnt |
-            awk -F/ 'NF<=4 {print NR") "$2"    （已用空间："$1"）"}' |
-            while IFS= read -r line; do
-                content_line "$line"
-            done
-
-        content_line "0) 返回上级菜单"
-        separator_line "="
-        read -p "请输入相应数字> " num
-        case "$num" in
-        0)
-            return 1
-            ;;
-        *)
-            dir=$(du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print $2}' | sed -n "$num"p)
-            if [ ! -f "$dir/asusware.arm/etc/init.d/S50downloadmaster" ]; then
-                double_line_break
-                separator_line "="
-                content_line "\033[33m未找到下载大师自启文件：\033[0m"
-                content_line "\033[33m$dir/asusware.arm/etc/init.d/S50downloadmaster\033[0m"
-                content_line "\033[33m请检查设置！\033[0m"
-                separator_line "="
-
-                continue
-            fi
-            return 0
-            ;;
-        esac
-    done
+	cecho "\033[33m检测到当前设备为华硕固件，请选择安装方式\033[0m"
+	cecho " 1 基于U盘+下载大师安装(支持所有固件，限ARM设备，须插入U盘或移动硬盘)"
+	cecho " 2 基于自启脚本安装(仅支持部分梅林固件)"
+	cecho " 0 退出安装"
+	echo "-----------------------------------------------"
+	read -p "请输入相应数字 > " num
+	case "$num" in
+	1)
+		echo -e "请先在路由器网页后台安装下载大师并启用，之后选择外置存储所在目录！"
+		sleep 2
+		set_asus_usb
+	;;
+	2)
+		cecho "如开机无法正常自启，请重新使用U盘+下载大师安装！"
+		sleep 2
+		dir=/jffs
+	;;
+	*)
+		exit 1
+	;;
+	esac
 }
-
 set_cust_dir() {
     while true; do
-        double_line_break
-        separator_line "="
-        content_line "\033[33m注意：\033[0m"
-        content_line "\033[33m路径必须是带 / 的格式\033[0m"
-        content_line "\033[33m写入虚拟内存（/tmp，/opt，/sys...）的文件会在重启后消失！\033[0m"
-        separator_line "-"
-        content_line "参考路经："
-        separator_line "-"
-
-        # original version
-        # df -h | awk '{print $6,$4}' | sed 1d
-        df -h |
-            awk 'NR>1 {
-                path="";
-                for(i=6;i<=NF;i++) path=path $i " ";
-                sub(/ $/, "", path);
-                print path "|" $4
-            }' |
-            while IFS='|' read -r mount_point path_avail; do
-                if [ -n "$mount_point" ]; then
-                    i=$((i + 1))
-                    printf -v line_content "%-3s %s" "$i)" "$mount_point"
-                    content_line "$line_content"
-                    sub_content_line " （可用空间：$path_avail）"
-                fi
-            done
-
-        content_line "0) 返回上级菜单"
-        separator_line "="
-        read -p "请输入自定义路径> " dir
-        case "$dir" in
-        0)
-            return 1
-            ;;
-        *)
-            if [ "$(dir_avail "$dir")" = 0 ] || [ -n "$(echo "$dir" | grep -E 'tmp|opt|sys')" ]; then
-                invalid_input_retry
-                continue
-            fi
-            return 0
-            ;;
-        esac
+        echo "-----------------------------------------------"
+        echo '可用路径 剩余空间：'
+        df -h | awk '{print $6,$4}' | sed 1d
+        echo '路径是必须带 / 的格式，注意写入虚拟内存(/tmp,/opt,/sys...)的文件会在重启后消失！！！'
+        read -p "请输入自定义路径 > " dir
+        if [ "$(dir_avail "$dir")" = 0 ] || [ -n "$(echo "$dir" | grep -Eq '^/(tmp|opt|sys)(/|$)')" ]; then
+            cecho "\033[31m路径错误！请重新设置！\033[0m"
+            continue
+        fi
+        break 1
     done
 }
 
 setdir() {
     while true; do
-        double_line_break
-        separator_line "="
-        content_line "\033[33m注意：\033[0m"
-        content_line "\033[33m安装ShellCrash至少需要预留约 1MB 的磁盘空间\033[0m"
-        if [ -n "$systype" ]; then
-            [ "$systype" = "Padavan" ] && dir=/etc/storage
-
-            [ "$systype" = "mi_snapshot" ] && {
-                content_line "\033[33m检测到当前设备为小米官方系统\033[0m"
-
-                separator_line "-"
-                content_line "请选择安装位置："
-                separator_line "-"
-
-                if [ -d /data ]; then
-                    content_line "1) 安装到 /data 目录"
-                    sub_content_line "剩余空间：$(dir_avail /data -h)（支持软固化功能）"
-                fi
-
-                if [ -d /userdisk ]; then
-                    content_line "2) 安装到 /userdisk 目录"
-                    sub_content_line "剩余空间：$(dir_avail /userdisk -h)（支持软固化功能）"
-                fi
-
-                if [ -d /data/other_vol ]; then
-                    content_line "3) 安装到 /data/other_vol 目录"
-                    sub_content_line "剩余空间：$(dir_avail /data/other_vol -h)（支持软固化功能）"
-                fi
-
-                content_line "4) 安装到自定义目录"
-                sub_content_line "（不推荐，不明勿用！）"
-
-                content_line "E) 退出安装"
-                separator_line "="
-                read -p "请输入相应数字> " num
-                case "$num" in
-                1)
-                    dir=/data
-                    ;;
-                2)
-                    dir=/userdisk
-                    ;;
-                3)
-                    dir=/data/other_vol
-                    ;;
-                4)
-                    set_cust_dir
-                    ret=$?
-                    [ "$ret" -eq 1 ] && continue
-                    ;;
-                "E" | "e")
-                    abort_install
-                    ;;
-                *)
-                    invalid_input_retry
-                    continue
-                    ;;
-                esac
-            }
-
-            [ "$systype" = "asusrouter" ] && {
-
-                content_line "\033[33m检测到当前设备为华硕固件\033[0m"
-                separator_line "-"
-                content_line "请选择安装方式："
-                separator_line "-"
-
-                content_line "1) 基于USB设备安装"
-                sub_content_line "（限23年9月之前固件，须插入任意USB设备）"
-
-                content_line "2) 基于自启脚本安装"
-                sub_content_line "（仅支持梅林及部分非koolshare官改固件）"
-
-                content_line "3) 基于U盘 + 下载大师安装"
-                sub_content_line "（支持所有固件，限ARM设备，须插入U盘或移动硬盘）"
-
-                content_line "E) 退出安装"
-                separator_line "="
-
-                read -p "请输入相应数字> " num
-                case "$num" in
-                1)
-                    double_line_break
-                    separator_line "="
-                    content_line "请选择脚本安装位置："
-                    separator_line "-"
-                    content_line "1) USB存储"
-                    content_line "2) 系统闪存"
-                    separator_line "="
-                    read -p "请输入相应数字> " num
-                    case "$num" in
-                    1)
-                        set_usb_dir
-                        ;;
-                    *)
-                        dir=/jffs
-                        ;;
-                    esac
-
-                    usb_status=1
-                    ;;
-                2)
-                    double_line_break
-                    separator_line "="
-                    content_line "如无法正常开机启动，请重新使用USB方式安装！"
-                    separator_line "="
-                    sleep 2
-
-                    dir=/jffs
-                    ;;
-                3)
-                    double_line_break
-                    separator_line "="
-                    content_line "请先在路由器网页后台安装下载大师并启用，"
-                    content_line "之后选择外置存储所在目录！"
-                    separator_line "="
-                    sleep 2
-
-                    set_asus_dir
-                    ret=$?
-                    [ "$ret" -eq 1 ] && continue
-                    ;;
-                "E" | "e")
-                    abort_install
-                    ;;
-                *)
-                    invalid_input_retry
-                    continue
-                    ;;
-                esac
-            }
-
-            [ "$systype" = "ng_snapshot" ] && dir=/tmp/mnt
-        else
-            separator_line "-"
-            content_line "请选择安装目录："
-            separator_line "-"
-            content_line "1) \033[32m/etc目录\033[0m        （适合root用户）"
-            content_line "2) \033[32m/usr/share目录\033[0m  （适合Linux系统）"
-            content_line "3) \033[32m当前用户目录\033[0m    （适合非root用户）"
-            content_line "4) \033[32m外置存储\033[0m"
-            content_line "5) 手动设置"
-            content_line "E) 退出安装"
-            separator_line "="
-            read -p "请输入相应数字> " num
-            # 设置目录
-            case "$num" in
-            1)
-                dir=/etc
-                ;;
-            2)
-                dir=/usr/share
-                ;;
-            3)
-                dir=~/.local/share
-                mkdir -p ~/.config/systemd/user
-                ;;
-            4)
-                set_usb_dir
-                ret=$?
-                [ "$ret" -eq 1 ] && continue
-                ;;
-            5)
-                set_cust_dir
-                ret=$?
-                [ "$ret" -eq 1 ] && continue
-                ;;
-            "E" | "e")
-                abort_install
-                ;;
-            *)
-                invalid_input_retry
-                continue
-                ;;
-            esac
-        fi
+        echo "-----------------------------------------------"
+        cecho "\033[33m注意：安装ShellCrash至少需要预留约1MB的磁盘空间\033[0m"
+        case "$systype" in
+			Padavan) dir=/etc/storage ;;
+			mi_snapshot) set_xiaomi_dir ;;
+			asusrouter) set_asus_dir ;;
+			ng_snapshot) dir=/tmp/mnt ;;
+			*)
+				cecho " 1 在\033[32m/etc目录\033[0m下安装(适合root用户)"
+				cecho " 2 在\033[32m/usr/share目录\033[0m下安装(适合Linux系统)"
+				cecho " 3 在\033[32m当前用户目录\033[0m下安装(适合非root用户)"
+				cecho " 4 在\033[32m外置存储\033[0m中安装"
+				cecho " 5 手动设置安装目录"
+				cecho " 0 退出安装"
+				echo "----------------------------------------------"
+				read -p "请输入相应数字 > " num
+				# 设置目录
+				case "$num" in
+				1)
+					dir=/etc
+					;;
+				2)
+					dir=/usr/share
+					;;
+				3)
+					dir=~/.local/share
+					mkdir -p ~/.config/systemd/user
+					;;
+				4)
+					set_usb_dir
+					;;
+				5)
+					set_cust_dir
+					;;
+				*)
+					echo "安装已取消"
+					exit 1
+					;;
+				esac
+			;;
+		esac
 
         if [ ! -w "$dir" ]; then
-            double_line_break
-            separator_line "="
-            content_line "\033[31m没有$dir目录写入权限！\033[0m"
-            content_line "\033[31m请重新设置！\033[0m"
-            separator_line "="
-            sleep 2
+            cecho "\033[31m没有$dir目录写入权限！请重新设置！\033[0m"
+            sleep 1
         else
-            while true; do
-                double_line_break
-                separator_line "="
-                content_line "目标目录：\033[32m$dir\033[0m"
-                content_line "可用空间：$(dir_avail $dir -h)"
-                separator_line "-"
-                content_line "1) 确认安装"
-                content_line "E) 退出安装"
-                content_line "0) 返回上级菜单"
-                separator_line "="
-                read -p "请输入相应数字> " num
-                case "$num" in
-                0)
-                    break 1
-                    ;;
-                1)
-                    CRASHDIR="${dir}/ShellCrash"
-                    break 2
-                    ;;
-                "E" | "e")
-                    abort_install
-                    ;;
-                *)
-                    invalid_input_retry
-                    continue
-                    ;;
-                esac
-            done
+            cecho "目标目录\033[32m$dir\033[0m空间剩余：$(dir_avail "$dir" -h)"
+            read -p "确认安装？(1/0) > " res
+            if [ "$res" = "1" ]; then
+                CRASHDIR="$dir"/ShellCrash
+                break
+            fi
         fi
     done
 }
-
 install() {
-    double_line_break
-    separator_line "="
-    content_line "下载安装文件......"
+    echo "-----------------------------------------------"
+    echo "开始从服务器获取安装文件！"
+    echo "-----------------------------------------------"
     gettar
-    double_line_break
-    separator_line "="
-    content_line "ShellCrash 已经安装成功！"
-    [ "$profile" = "~/.bashrc" ] && content_line "请执行【. ~/.bashrc > /dev/null】命令以更新环境变量！"
-    [ -n "$(ls -l /bin/sh | grep -oE 'zsh')" ] && content_line "请执行【. ~/.zshrc > /dev/null】命令以更新环境变量！"
-    content_line "输入\033[32m $my_alias \033[0m命令即可管理！"
-    separator_line "="
-    double_line_break
+    echo "-----------------------------------------------"
+    echo "ShellCrash 已经安装成功!"
+    [ "$profile" = "~/.bashrc" ] && echo "请执行【. ~/.bashrc > /dev/null】命令以更新环境变量！"
+    [ -n "$(ls -l /bin/sh | grep -oE 'zsh')" ] && echo "请执行【. ~/.zshrc > /dev/null】命令以更新环境变量！"
+    echo "-----------------------------------------------"
+    cecho "\033[33m输入\033[30;47m $my_alias \033[0;33m命令即可管理！！！\033[0m"
+    echo "-----------------------------------------------"
 }
-
 setversion() {
-    while true; do
-        double_line_break
-        separator_line "="
-        content_line "请选择安装版本："
-        separator_line "-"
-        content_line "1) \033[32m公测版（推荐）\033[0m"
-        content_line "2) \033[36m稳定版\033[0m"
-        content_line "3) \033[31m开发版\033[0m"
-        content_line "E) 退出安装"
-        separator_line "="
-        read -p "请输入相应数字> " num
-        case "$num" in
-        1)
-            break 1
-            ;;
-        2)
-            url=$(echo "$url" | sed 's/master/stable/')
-            break 1
-            ;;
-        3)
-            url=$(echo "$url" | sed 's/master/dev/')
-            break 1
-            ;;
-        "E" | "e")
-            abort_install
-            ;;
-        *)
-            invalid_input_retry
-            continue
-            ;;
-        esac
-    done
+    echo "-----------------------------------------------"
+    cecho "\033[33m请选择想要安装的版本：\033[0m"
+    cecho " 1 \033[32m公测版(推荐)\033[0m"
+    cecho " 2 \033[36m稳定版\033[0m"
+    cecho " 3 \033[31m开发版\033[0m"
+    echo "-----------------------------------------------"
+    read -p "请输入相应数字 > " num
+    case "$num" in
+    2)
+		url=$(echo "$url" | sed 's/master/stable/')
+	;;
+    3)
+		url=$(echo "$url" | sed 's/master/dev/')
+	;;
+    *) ;;
+    esac
 }
 
-# =============================== the script start here ================================
-
-# clean screen
-printf "\033[H\033[2J"
-
-double_line_break
-separator_line "="
-content_line "                       欢迎使用"
-content_line "                      ShellCrash"
-content_line
-content_line "            支持各种基于 openwrt 的路由器设备"
-content_line "           支持Debian、Centos等标准 Linux 系统"
-content_line "          如遇问题请加TG群反馈：t.me/ShellClash"
-content_line
-content_line "                                            by Juewuy"
-separator_line "="
-
-# 特殊固件识别及标记
-[ -f "/etc/storage/started_script.sh" ] && {
-    systype=Padavan # 老毛子固件
-    initdir='/etc/storage/started_script.sh'
+# 安装检查
+check_systype() {
+	[ -f "/etc/storage/started_script.sh" ] && {
+		systype=Padavan #老毛子固件
+		initdir='/etc/storage/started_script.sh'
+	}
+	[ -d "/jffs" ] && {
+		systype=asusrouter #华硕固件
+		[ -f "/jffs/.asusrouter" ] && initdir='/jffs/.asusrouter'
+		[ -d "/jffs/scripts" ] && initdir='/jffs/scripts/nat-start'
+	}
+	[ -f "/data/etc/crontabs/root" ] && systype=mi_snapshot #小米设备
+	[ -w "/var/mnt/cfg/firewall" ] && systype=ng_snapshot   #NETGEAR设备
 }
-[ -d "/jffs" ] && {
-    systype=asusrouter # 华硕固件
-    [ -f "/jffs/.asusrouter" ] && initdir='/jffs/.asusrouter'
-    [ -d "/jffs/scripts" ] && initdir='/jffs/scripts/nat-start'
+check_user() {
+	if [ "$USER" != "root" ] && [ -z "$systype" ]; then
+		echo "当前用户:$USER"
+		cecho "\033[31m请尽量使用root用户（不要直接使用sudo命令！）执行安装!\033[0m"
+		echo "-----------------------------------------------"
+		read -p "仍要安装？可能会产生未知错误！(1/0) > " res
+		[ "$res" != "1" ] && exit 1
+	fi
 }
-[ -f "/data/etc/crontabs/root" ] && systype=mi_snapshot # 小米设备
-[ -w "/var/mnt/cfg/firewall" ] && systype=ng_snapshot   # NETGEAR设备
+check_version() {
+	echo "$url" | grep -q 'master' && setversion
+	webget /tmp/version "$url/version" echooff
+	[ "$result" = "200" ] && versionsh=$(cat /tmp/version)
+	rm -rf /tmp/version
 
-# 检查root权限
-if [ "$USER" != "root" ] && [ -z "$systype" ]; then
-    while true; do
-        double_line_break
-        separator_line "="
-        content_line "当前用户 $USER 非 root 用户"
-        content_line "\033[33m请尽量使用 root 用户（不要直接使用sudo命令）执行安装！\033[0m"
-        content_line "\033[31m继续安装，可能会产生未知错误！\033[0m"
-        separator_line "-"
-        content_line "1) 继续安装"
-        content_line "E) 退出安装"
-        separator_line "="
-        read -p "请输入相应数字> " num
-        case "$num" in
-        1)
-            break 1
-            ;;
-        "E" | "e")
-            abort_install
-            ;;
-        *)
-            invalid_input_retry
-            continue
-            ;;
-        esac
-    done
-fi
+	# 输出
+	cecho "最新版本：\033[32m$versionsh\033[0m"
+	echo "-----------------------------------------------"
+	cecho "\033[44m如遇问题请加TG群反馈：\033[42;30m t.me/ShellClash \033[0m"
+	cecho "\033[37m支持各种基于openwrt的路由器设备"
+	cecho "\033[33m支持Debian、Centos等标准Linux系统\033[0m"
+}
+check_dir() {
+	if [ -n "$CRASHDIR" ]; then
+		echo "-----------------------------------------------"
+		cecho "检测到旧的安装目录\033[36m$CRASHDIR\033[0m，是否覆盖安装？"
+		cecho "\033[32m覆盖安装时不会移除配置文件！\033[0m"
+		echo " 1 覆盖安装"
+		echo " 2 卸载旧版本并安装"
+		echo " 0 取消安装"
+		read -p "请输入相应数字 > " num
+		case "$num" in
+		1)
+			install
+			;;
+		2)
+			[ "$CRASHDIR" != "/" ] && rm -rf "$CRASHDIR"
+			echo "-----------------------------------------------"
+			cecho "\033[31m 旧版本文件已卸载！\033[0m"
+			setdir
+			install
+			;;
+		9)
+			echo "测试模式，变更安装位置 $CRASHDIR"
+			setdir
+			install
+			;;
+		*)
+			cecho "\033[31m已取消安装！\033[0m"
+			exit 1
+			;;
+		esac
+	else
+		setdir
+		install
+	fi
+}
 
-if echo "$url" | grep -q 'master'; then
-    setversion
-fi
-
-# 获取版本信息
-webget /tmp/version "$url/version" echooff
-[ "$result" = "200" ] && versionsh=$(cat /tmp/version)
-rm -rf /tmp/version
-
-# 输出
-double_line_break
-separator_line "="
-content_line "最新版本：\033[32m$versionsh\033[0m"
-separator_line "="
-
-if [ -n "$CRASHDIR" ]; then
-    while true; do
-        double_line_break
-        separator_line "="
-        content_line "检测到旧版本安装目录：\033[36m$CRASHDIR\033[0m"
-        content_line "\033[33m注意：覆盖安装时不会移除配置文件！\033[0m"
-        separator_line "-"
-        content_line "1) 覆盖安装"
-        content_line "2) 卸载旧版本"
-        content_line "E) 退出安装"
-        separator_line "="
-        read -p "请输入相应数字> " num
-        case "$num" in
-        1)
-            install
-            break 1
-            ;;
-        2)
-            rm -rf "$CRASHDIR"
-
-            double_line_break
-            separator_line "="
-            content_line "\033[31m旧版本文件已卸载！\033[0m"
-            separator_line "="
-
-            setdir
-            install
-
-            break 1
-            ;;
-        9)
-            double_line_break
-            separator_line "="
-            content_line "测试模式，变更安装位置"
-            separator_line "="
-
-            setdir
-            install
-
-            break 1
-            ;;
-        "E" | "e")
-            abort_install
-            ;;
-        *)
-            invalid_input_retry
-            continue
-            ;;
-        esac
-    done
-else
-    setdir
-    install
-fi
+check_systype
+check_user
+check_version
+check_dir
diff --git a/scripts/init.sh b/scripts/init.sh
index 4670d052..3a3e358f 100644
--- a/scripts/init.sh
+++ b/scripts/init.sh
@@ -231,4 +231,4 @@ sed -i "s/redir_mod=纯净模式/firewall_area=4/g" "$CFG_PATH"
 sed -i 's/=\(已启用\|已开启\)$/=ON/'  "$CFG_PATH"
 sed -i 's/=\(未启用\|未开启\)$/=OFF/' "$CFG_PATH"
 
-echo -e "\033[32m脚本初始化完成,请输入\033[30;47m $my_alias \033[0;33m命令开始使用！\033[0m"
+printf '\033[32m脚本初始化完成,请输入\033[30;47m %s \033[0;33m命令开始使用！\033[0m\n' "$my_alias"
diff --git a/scripts/menus/set_crashdir.sh b/scripts/menus/set_crashdir.sh
index 2f1be6c9..5109fbd1 100644
--- a/scripts/menus/set_crashdir.sh
+++ b/scripts/menus/set_crashdir.sh
@@ -1,150 +1,157 @@
 #!/bin/sh
 # Copyright (C) Juewuy
 
-. /tmp/SC_tmp/libs/check_dir_avail.sh
-[ -n "$(echo -e | grep e)" ] && echo=echo || echo='echo -e'
+#. /tmp/SC_tmp/libs/check_dir_avail.sh
 
-set_crashdir() {
-    set_usb_dir() {
-        echo -e "请选择安装目录"
+cecho() {
+    printf '%b\n' "$*"
+}
+set_usb_dir() {
+    while true; do
+        cecho "请选择安装目录"
         du -hL /mnt | awk '{print " "NR" "$2"  "$1}'
         read -p "请输入相应数字 > " num
         dir=$(du -hL /mnt | awk '{print $2}' | sed -n "$num"p)
         if [ -z "$dir" ]; then
-            echo -e "\033[31m输入错误！请重新设置！\033[0m"
-            set_usb_dir
+            cecho "\033[31m输入错误！请重新设置！\033[0m"
+            continue
         fi
-    }
-    set_asus_dir() {
-        echo -e "请选择U盘目录"
-        du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print " "NR" "$2"  "$1}'
-        read -p "请输入相应数字 > " num
-        dir=$(du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print $2}' | sed -n "$num"p)
-        if [ ! -f "$dir/asusware.arm/etc/init.d/S50downloadmaster" ]; then
-            echo -e "\033[31m未找到下载大师自启文件：$dir/asusware.arm/etc/init.d/S50downloadmaster，请检查设置！\033[0m"
-            set_asus_dir
-        fi
-    }
-    set_cust_dir() {
+        break 1
+    done
+}
+set_xiaomi_dir() {
+	cecho "\033[33m检测到当前设备为小米官方系统，请选择安装位置\033[0m"
+	[ -d /data ] && cecho " 1 安装到 /data 目录,剩余空间：$(dir_avail /data -h)(支持软固化功能)"
+	[ -d /userdisk ] && cecho " 2 安装到 /userdisk 目录,剩余空间：$(dir_avail /userdisk -h)(支持软固化功能)"
+	[ -d /data/other_vol ] && cecho " 3 安装到 /data/other_vol 目录,剩余空间：$(dir_avail /data/other_vol -h)(支持软固化功能)"
+	cecho " 4 安装到自定义目录(不推荐，不明勿用！)"
+	cecho " 0 退出安装"
+	echo "-----------------------------------------------"
+	read -p "请输入相应数字 > " num
+	case "$num" in
+	1)
+		dir=/data
+		;;
+	2)
+		dir=/userdisk
+		;;
+	3)
+		dir=/data/other_vol
+		;;
+	4)
+		set_cust_dir
+		;;
+	*)
+		exit 1
+		;;
+	esac
+}
+set_asus_usb() {
+	while true; do
+		echo -e "请选择U盘目录"
+		du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print " "NR" "$2"  "$1}'
+		read -p "请输入相应数字 > " num
+		dir=$(du -hL /tmp/mnt | awk -F/ 'NF<=4' | awk '{print $2}' | sed -n "$num"p)
+		if [ ! -f "$dir/asusware.arm/etc/init.d/S50downloadmaster" ]; then
+			echo -e "\033[31m未找到下载大师自启文件：$dir/asusware.arm/etc/init.d/S50downloadmaster，请检查设置！\033[0m"
+			sleep 1
+		else
+			break
+		fi
+	done
+}
+set_asus_dir() {
+	cecho "\033[33m检测到当前设备为华硕固件，请选择安装方式\033[0m"
+	cecho " 1 基于U盘+下载大师安装(支持所有固件，限ARM设备，须插入U盘或移动硬盘)"
+	cecho " 2 基于自启脚本安装(仅支持部分梅林固件)"
+	cecho " 0 退出安装"
+	echo "-----------------------------------------------"
+	read -p "请输入相应数字 > " num
+	case "$num" in
+	1)
+		echo -e "请先在路由器网页后台安装下载大师并启用，之后选择外置存储所在目录！"
+		sleep 2
+		set_asus_usb
+	;;
+	2)
+		cecho "如开机无法正常自启，请重新使用U盘+下载大师安装！"
+		sleep 2
+		dir=/jffs
+	;;
+	*)
+		exit 1
+	;;
+	esac
+}
+set_cust_dir() {
+    while true; do
         echo "-----------------------------------------------"
-        echo "可用路径 剩余空间:"
+        echo '可用路径 剩余空间：'
         df -h | awk '{print $6,$4}' | sed 1d
-        echo "路径是必须带 / 的格式，注意写入虚拟内存(/tmp,/opt,/sys...)的文件会在重启后消失！！！"
+        echo '路径是必须带 / 的格式，注意写入虚拟内存(/tmp,/opt,/sys...)的文件会在重启后消失！！！'
         read -p "请输入自定义路径 > " dir
-        if [ "$(dir_avail $dir)" = 0 ] || [ -n "$(echo $dir | grep -E 'tmp|opt|sys')" ]; then
-            echo "\033[31m路径错误！请重新设置！\033[0m"
-            set_cust_dir
+        if [ "$(dir_avail "$dir")" = 0 ] || [ -n "$(echo "$dir" | grep -Eq '^/(tmp|opt|sys)(/|$)')" ]; then
+            cecho "\033[31m路径错误！请重新设置！\033[0m"
+            continue
         fi
-    }
-    echo "-----------------------------------------------"
-    if [ -n "$systype" ]; then
-        [ "$systype" = "Padavan" ] && dir=/etc/storage
-        [ "$systype" = "mi_snapshot" ] && {
-            echo -e "\033[33m检测到当前设备为小米官方系统，请选择安装位置\033[0m"
-            [ -d /data ] && $echo " 1 安装到 /data 目录,剩余空间：$(dir_avail /data -h)(支持软固化功能)"
-            [ -d /userdisk ] && $echo " 2 安装到 /userdisk 目录,剩余空间：$(dir_avail /userdisk -h)(支持软固化功能)"
-            [ -d /data/other_vol ] && $echo " 3 安装到 /data/other_vol 目录,剩余空间：$(dir_avail /data/other_vol -h)(支持软固化功能)"
-            $echo " 4 安装到自定义目录(不推荐，不明勿用！)"
-            echo " 0 退出安装"
-            echo "-----------------------------------------------"
-            read -p "请输入相应数字 > " num
-            case "$num" in
-            1)
-                dir=/data
-                ;;
-            2)
-                dir=/userdisk
-                ;;
-            3)
-                dir=/data/other_vol
-                ;;
-            4)
-                set_cust_dir
-                ;;
-            *)
-                exit 1
-                ;;
-            esac
-        }
-        [ "$systype" = "asusrouter" ] && {
-            echo -e "\033[33m检测到当前设备为华硕固件，请选择安装方式\033[0m"
-            echo -e " 1 基于USB设备安装(限23年9月之前固件，须插入\033[31m任意\033[0mUSB设备)"
-            echo -e " 2 基于自启脚本安装(仅支持梅林及部分非koolshare官改固件)"
-            echo -e " 3 基于U盘+下载大师安装(支持所有固件，限ARM设备，须插入U盘或移动硬盘)"
-            echo -e " 0 退出安装"
-            echo "-----------------------------------------------"
-            read -p "请输入相应数字 > " num
-            case "$num" in
-            1)
-                read -p "将脚本安装到USB存储/系统闪存？(1/0) > " res
-                [ "$res" = "1" ] && set_usb_dir || dir=/jffs
-                usb_status=1
-                ;;
-            2)
-                echo -e "如无法正常开机启动，请重新使用USB方式安装！"
-                sleep 2
-                dir=/jffs
-                ;;
-            3)
-                echo -e "请先在路由器网页后台安装下载大师并启用，之后选择外置存储所在目录！"
-                sleep 2
-                set_asus_dir
-                ;;
-            *)
-                exit 1
-                ;;
-            esac
-        }
-        [ "$systype" = "ng_snapshot" ] && dir=/tmp/mnt
-    else
-        echo -e "\033[33m安装ShellCrash至少需要预留约1MB的磁盘空间\033[0m"
-        echo -e " 1 在\033[32m/etc目录\033[0m下安装(适合root用户)"
-        echo -e " 2 在\033[32m/usr/share目录\033[0m下安装(适合Linux系统)"
-        echo -e " 3 在\033[32m当前用户目录\033[0m下安装(适合非root用户)"
-        echo -e " 4 在\033[32m外置存储\033[0m中安装"
-        echo -e " 5 手动设置安装目录"
-        echo -e " 0 退出安装"
-        echo "-----------------------------------------------"
-        read -p "请输入相应数字 > " num
-        #设置目录
-        case "$num" in
-        1)
-            dir=/etc
-            ;;
-        2)
-            dir=/usr/share
-            ;;
-        3)
-            dir=~/.local/share
-            mkdir -p ~/.config/systemd/user
-            ;;
-        4)
-            set_usb_dir
-            ;;
-        5)
-            echo "-----------------------------------------------"
-            echo "可用路径 剩余空间:"
-            df -h | awk '{print $6,$4}' | sed 1d
-            echo "路径是必须带 / 的格式，注意写入虚拟内存(/tmp,/opt,/sys...)的文件会在重启后消失！！！"
-            read -p "请输入自定义路径 > " dir
-            if [ -z "$dir" ]; then
-                echo -e "\033[31m路径错误！请重新设置！\033[0m"
-                setdir
-            fi
-            ;;
-        *)
-            echo "安装已取消"
-            exit 1
-            ;;
-        esac
-    fi
-
-    if [ ! -w $dir ]; then
-        echo -e "\033[31m没有$dir目录写入权限！请重新设置！\033[0m" && sleep 1 && setdir
-    else
-        echo -e "目标目录\033[32m$dir\033[0m空间剩余：$(dir_avail $dir -h)"
-        read -p "确认安装？(1/0) > " res
-        [ "$res" = "1" ] && CRASHDIR=$dir/ShellCrash || setdir
-    fi
+        break 1
+    done
 }
 
+set_crashdir() {
+    while true; do
+        echo "-----------------------------------------------"
+        cecho "\033[33m注意：安装ShellCrash至少需要预留约1MB的磁盘空间\033[0m"
+        case "$systype" in
+			Padavan) dir=/etc/storage ;;
+			mi_snapshot) set_xiaomi_dir ;;
+			asusrouter) set_asus_dir ;;
+			ng_snapshot) dir=/tmp/mnt ;;
+			*)
+				cecho " 1 在\033[32m/etc目录\033[0m下安装(适合root用户)"
+				cecho " 2 在\033[32m/usr/share目录\033[0m下安装(适合Linux系统)"
+				cecho " 3 在\033[32m当前用户目录\033[0m下安装(适合非root用户)"
+				cecho " 4 在\033[32m外置存储\033[0m中安装"
+				cecho " 5 手动设置安装目录"
+				cecho " 0 退出安装"
+				echo "----------------------------------------------"
+				read -p "请输入相应数字 > " num
+				# 设置目录
+				case "$num" in
+				1)
+					dir=/etc
+					;;
+				2)
+					dir=/usr/share
+					;;
+				3)
+					dir=~/.local/share
+					mkdir -p ~/.config/systemd/user
+					;;
+				4)
+					set_usb_dir
+					;;
+				5)
+					set_cust_dir
+					;;
+				*)
+					echo "安装已取消"
+					exit 1
+					;;
+				esac
+			;;
+		esac
+
+        if [ ! -w "$dir" ]; then
+            cecho "\033[31m没有$dir目录写入权限！请重新设置！\033[0m"
+            sleep 1
+        else
+            cecho "目标目录\033[32m$dir\033[0m空间剩余：$(dir_avail "$dir" -h)"
+            read -p "确认安装？(1/0) > " res
+            if [ "$res" = "1" ]; then
+                CRASHDIR="$dir"/ShellCrash
+                break
+            fi
+        fi
+    done
+}