Boot from Windows

winboot.sh

#!/bin/bash

# Tiny little helper script to automatically grab the boot ID
# from grub.cfg and force to boot into windows next booth then reboot.
# https://tcpip.wtf

# Request sudo access
if [ "$EUID" -ne 0 ]; then
  echo "Please run as root"
  sudo "$0"
  exit
fi

# Rest of script runs as root

# Path to grub config
grub_cfg="/boot/grub2/grub.cfg"

# Check if grub config file exists
if [ ! -f "$grub_cfg" ]; then
  echo "Grub config $grub_cfg not found" >&2
  exit 1
fi

# Search for Windows Boot Manager in grub config
if ! grep -q "Windows Boot Manager" "$grub_cfg"; then
  echo "Windows Boot Manager not found in $grub_cfg" >&2
  exit 1
fi

# Extract Windows boot ID from grub config
windows_boot_id=""
windows_boot_line=$(grep "Windows Boot Manager" "$grub_cfg")
if [[ $windows_boot_line =~ menuentry\ .*\ \$menuentry_id_option\ \'([^\']+)\' ]]; then
  windows_boot_id="${BASH_REMATCH[1]}"
fi

# Validate extracted ID
if [ -z "$windows_boot_id" ]; then
  echo "Failed to extract Windows boot ID" >&2
  exit 1
fi

echo "Found Windows boot ID: $windows_boot_id"

# Confirm reboot to Windows
read -p "Reboot to Windows (Y/N)? " confirm
if [[ $confirm != [Yy] ]]; then
  exit 0
fi

# Reboot using grub-reboot or grub2-reboot
if command -v grub-reboot >/dev/null 2>&1; then
  if ! sudo grub-reboot "$windows_boot_id"; then
    echo "grub-reboot failed" >&2
    exit 1
  fi
elif command -v grub2-reboot >/dev/null 2>&1; then
  if ! sudo grub2-reboot "$windows_boot_id"; then
    echo "grub2-reboot failed" >&2
    exit 1
  fi
else
  echo "Neither grub-reboot nor grub2-reboot found" >&2
  exit 1
fi

sudo reboot --reboot --no-wall