diff --git a/.treefmt.toml b/.treefmt.toml
index 909299fd..2b219780 100644
--- a/.treefmt.toml
+++ b/.treefmt.toml
@@ -14,3 +14,8 @@ excludes = [
 command  = "nixfmt"
 options  = [ "-s" ]
 includes = [ "*.nix" ]
+
+[formatter.shfmt]
+command  = "shfmt"
+options  = [ "-s", "-w" ]
+includes = [ "*.sh" ]
diff --git a/Bootstrap.sh b/Bootstrap.sh
index 8766f77e..caf91bf1 100755
--- a/Bootstrap.sh
+++ b/Bootstrap.sh
@@ -6,7 +6,7 @@ cfg="$(realpath .)"
 target="${1}"
 host="${2}"
 
-if [[ "${target}" = "" ]]; then
+if [[ ${target} == "" ]]; then
 	printf "Usage: ./.Bootstrap.sh <DRIVE> [HOST]\n"
 	exit 2
 fi
@@ -33,7 +33,7 @@ nixos-generate-config --root /mnt
 
 # Install.
 cd /mnt
-if [[ "${host}" = "" ]]; then
+if [[ ${host} == "" ]]; then
 	printf "Warning: Installing basic system.\n"
 	nixos-install
 else
diff --git a/flake.nix b/flake.nix
index 7276dfc6..a2dea592 100644
--- a/flake.nix
+++ b/flake.nix
@@ -156,6 +156,7 @@
             nativeBuildInputs = with pkgs; [
               nixd
               nixfmt-rfc-style
+              shfmt
               treefmt
             ];
             # buildInputs = with pkgs; [ ];