diff --git a/install.sh b/install.sh
index 213232f..ac5c7bf 100644
--- a/install.sh
+++ b/install.sh
@@ -17,7 +17,7 @@ fi
 lsblk
 echo -n "> what drive to install on? /dev/"
 read drive
-sudo fdisk "/dev/$drive" << "EOF"
+sudo fdisk "/dev/$drive" << EOF
 o
 n
 p
@@ -26,17 +26,18 @@ p
 
 a
 w
-EOF > /dev/null || exit 1
-echo "> created DOS partition table on $disk with one bootable partition."
-sudo mkfs.ext4 $disk*1 || exit 1 # /dev/sda 1 or /dev/nvme0n1 p1 => *1 instead of just 1
+EOF
+if [ $? != 0 ] ; then exit 1 ; fi
+echo "> created DOS partition table on $drive with one bootable partition."
+sudo mkfs.ext4 $drive*1 || exit 1 # /dev/sda 1 or /dev/nvme0n1 p1 => *1 instead of just 1
 echo "> formatted."
-sudo mount $disk*1 /mnt || exit 1
+sudo mount $drive*1 /mnt || exit 1
 echo "> mounted."
 echo "> generating config"
 sudo nixos-generate-config --root /mnt
 cd /mnt/etc/nixos
 echo -n "hostname: "
-sudo sed -i -E "s/^}\$/  boot.loader.grub.device = \"\/dev\/$disk\";\n  networking.hostName = \"$(head -n1)\";\n}/" hardware-configuration.nix
+sudo sed -i -E "s/^}\$/  boot.loader.grub.device = \"\/dev\/$drive\";\n  networking.hostName = \"$(head -n1)\";\n}/" hardware-configuration.nix
 echo "> installing git"
 nix-env -i git > /dev/null || exit 1
 echo "> downloading tudbut/nix-setup"