diff --git a/debian-update.sh b/debian-update.sh
new file mode 100644
index 0000000..ec216a2
--- /dev/null
+++ b/debian-update.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+## "curl -s https://git.tic.cc/opx/sysconfig/raw/branch/main/debian-update.sh | bash"
+
+echo "Update the current Debian major version to the next newer major version. For instance, update 11 to 12, or 12 to 13" 
+echo "Usage: this.sh"
+echo "Example: this.sh"
+
+if [ -f /etc/debian_version ]; then
+  OsTypeNow="Debian"
+  OsVersionNow=`cat /etc/debian_version 2>/dev/null`
+  OsMajorVersionNow=`echo $OsVersionNow | cut -d '.' -f 1`
+# elif [ -f /etc/ubuntu_version ]; then
+#   OsTypeNow="Ubuntu"
+#   OsVersionNow=`cat /etc/ubuntu_version 2>/dev/null`
+else
+  echo "Unsupported OS. Only Debian can be updated."
+  exit 1
+fi
+
+echo Current OS: $OsTypeNow $OsVersionNow
+
+# set CodeNameNow and CodeNameNext based on the current version
+if [ "$OsTypeNow" = "Debian" ]; then
+  if [ "$OsMajorVersionNow" = "11" ]; then
+    CodeNameNow="bullseye"
+    CodeNameNext="bookworm"
+  elif [ "$OsMajorVersionNow" = "12" ]; then
+    CodeNameNow="bookworm"
+    CodeNameNext="trixie"
+  else
+    echo "Unsupported Debian version: $OsVersionNow"
+    exit 1
+  fi
+else
+  echo "Unsupported OS type: $OsTypeNow"
+  exit 1
+fi
+
+echo "Are you sure to update $OsTypeNow $CodeNameNow to $CodeNameNext?"
+echo "  [y] Yes, update now"
+echo "  [anything else] No, cancel update"
+read -r answer
+if [ "$answer" != "y" ]; then
+  echo "Update canceled."
+  exit 0
+fi
+
+# 检查并解除包锁定（有锁定会导致升级失败）
+apt-mark showhold | grep -v "^$" && apt-mark unhold $(apt-mark showhold)
+# 更新11系统至最新版本
+apt update && apt upgrade -y
+apt full-upgrade -y  # 处理依赖与内核升级
+apt --purge autoremove -y  # 清理无用包
+apt clean  # 清空APT缓存
+
+# 替换bullseye为bookworm（覆盖主配置与子目录）
+sed -i "s/$CodeNameNow/$CodeNameNext/g" /etc/apt/sources.list
+sed -i "s/$CodeNameNow/$CodeNameNext/g" /etc/apt/sources.list.d/*.list
+
+apt update
+# 先最小升级（仅更新包，不安装/删除新包）
+apt upgrade --without-new-pkgs -y
+# 完整升级（处理依赖、内核替换、包移除）
+apt full-upgrade -y
+
+apt --purge autoremove -y
+apt clean
+
+echo "Updated! You can reboot now."
\ No newline at end of file
diff --git a/nixhome/.bashrc b/nixhome/.bashrc
index 163e236..943829d 100644
--- a/nixhome/.bashrc
+++ b/nixhome/.bashrc
@@ -153,9 +153,9 @@ elif [ -f /etc/ubuntu_version ]; then
   MYOSVERSION=Ubt`cat /etc/ubuntu_version 2>/dev/null`
 fi
 if [ "$color_prompt" = yes ]; then
-  PS1='<\[\033[$PSTYLE;${PTYPE}2m\]\t\[\033[00m\] \[\033[$PSTYLE;${PTYPE}5m\]\u\[\033[00m\] @\[\033[$PSTYLE;${PTYPE}1m\]\h\[\033[00m\] #\[\033[$PSTYLE;${PTYPE}6m\]$MYIPPUB\[\033[00m\] ^\[\033[$PSTYLE;${PTYPE}5m\]$(uname -m),$(uname),$MYOSVERSION\[\033[00m\] %\[\033[$PSTYLE;${PTYPE}2m\]\w/\[\033[00m\]>\n[\[\033[05;${PTYPE}4m\]\W/\[\033[00m\]] '
+  PS1='<\[\033[$PSTYLE;${PTYPE}2m\]\t\[\033[00m\] \[\033[$PSTYLE;${PTYPE}5m\]\u\[\033[00m\] @\[\033[$PSTYLE;${PTYPE}1m\]\h\[\033[00m\] =\[\033[$PSTYLE;${PTYPE}6m\]$MYIPPUB\[\033[00m\] #\[\033[$PSTYLE;${PTYPE}5m\]$(uname -m),$(uname),$MYOSVERSION\[\033[00m\] \[\033[$PSTYLE;${PTYPE}2m\]\w/\[\033[00m\]>\n[\[\033[05;34m\]\W/\[\033[00m\]] '
 else
-  PS1='<\t \u @\h #$MYIPPUB ^$(uname -m),$(uname),$MYOSVERSION %\w/>\n[\W/] ' # \w shows absolute path, \W shows current folder.
+  PS1='<\t \u @\h =$MYIPPUB #$(uname -m),$(uname),$MYOSVERSION \w/>\n[\W/] ' # \w shows absolute path, \W shows current folder.
 fi
 unset color_prompt force_color_prompt