diff --git a/home-manager/services/code-syncer/default.nix b/home-manager/services/code-syncer/default.nix
index be81b0804..ae4602ef5 100644
--- a/home-manager/services/code-syncer/default.nix
+++ b/home-manager/services/code-syncer/default.nix
@@ -1,6 +1,9 @@
 { pkgs, ... }:
+let
+  inherit (pkgs) lib;
+in
 {
-  launchd.agents.code-syncer = pkgs.lib.mkIf pkgs.stdenv.isDarwin {
+  launchd.agents.code-syncer = lib.mkIf pkgs.stdenv.isDarwin {
     enable = true;
     config = {
       ProgramArguments = [
@@ -8,7 +11,7 @@
         "${./sync.sh}"
       ];
       Environment = {
-        PATH = "${pkgs.lib.makeBinPath [
+        PATH = "${lib.makeBinPath [
           pkgs.fswatch
         ]}";
       };
@@ -18,4 +21,26 @@
       StandardErrorPath = "/tmp/code-syncer.error.log";
     };
   };
+
+  systemd.user.services.code-syncer = lib.mkIf pkgs.stdenv.isLinux {
+    Unit = {
+      Description = "VS Code settings syncer";
+    };
+    Service = {
+      Type = "simple";
+      Environment = "PATH=${
+        lib.makeBinPath [
+          pkgs.bash
+          pkgs.coreutils
+          pkgs.inotify-tools
+        ]
+      }";
+      ExecStart = "${pkgs.bash}/bin/bash ${./sync.sh}";
+      Restart = "always";
+      RestartSec = 10;
+    };
+    Install = {
+      WantedBy = [ "default.target" ];
+    };
+  };
 }
diff --git a/home-manager/services/code-syncer/sync.sh b/home-manager/services/code-syncer/sync.sh
index b65ec4d40..b29c62d88 100755
--- a/home-manager/services/code-syncer/sync.sh
+++ b/home-manager/services/code-syncer/sync.sh
@@ -3,12 +3,24 @@
 
 # --- CONFIGURATION ---
 
-# Base directories
-VSCODE_USER_DIR="$HOME/Library/Application Support/Code/User"
-VSCODE_INSIDERS_USER_DIR="$HOME/Library/Application Support/Code - Insiders/User"
-ANTIGRAVITY_USER_DIR="$HOME/Library/Application Support/Antigravity/User"
-CURSOR_USER_DIR="$HOME/Library/Application Support/Cursor/User"
-WINDSURF_USER_DIR="$HOME/Library/Application Support/Windsurf/User"
+# Detect OS
+OS_TYPE="$(uname -s)"
+
+# Base directories (OS-specific)
+if [ "$OS_TYPE" = "Darwin" ]; then
+  VSCODE_USER_DIR="$HOME/Library/Application Support/Code/User"
+  VSCODE_INSIDERS_USER_DIR="$HOME/Library/Application Support/Code - Insiders/User"
+  ANTIGRAVITY_USER_DIR="$HOME/Library/Application Support/Antigravity/User"
+  CURSOR_USER_DIR="$HOME/Library/Application Support/Cursor/User"
+  WINDSURF_USER_DIR="$HOME/Library/Application Support/Windsurf/User"
+else
+  # Linux/Other
+  VSCODE_USER_DIR="$HOME/.config/Code/User"
+  VSCODE_INSIDERS_USER_DIR="$HOME/.config/Code - Insiders/User"
+  ANTIGRAVITY_USER_DIR="$HOME/.config/Antigravity/User"
+  CURSOR_USER_DIR="$HOME/.config/Cursor/User"
+  WINDSURF_USER_DIR="$HOME/.config/Windsurf/User"
+fi
 
 # Files
 SETTINGS_FILE="settings.json"
@@ -94,14 +106,21 @@ clean_extension_list() {
     cp "$input_source" "$clean_file"
   fi
 
+  # Use appropriate sed syntax for OS
+  if [ "$OS_TYPE" = "Darwin" ]; then
+    SED_INPLACE="sed -i ''"
+  else
+    SED_INPLACE="sed -i"
+  fi
+
   for bad_ext in "${PROPRIETARY_EXTENSIONS[@]}"; do
     # Remove the line containing the bad extension
-    sed -i '' "/$bad_ext/d" "$clean_file"
+    $SED_INPLACE "/$bad_ext/d" "$clean_file"
   done
 
   for ai_ext in "${AI_EXTENSIONS[@]}"; do
     # Remove the line containing the AI extension
-    sed -i '' "/$ai_ext/d" "$clean_file"
+    $SED_INPLACE "/$ai_ext/d" "$clean_file"
   done
 }
 
@@ -394,14 +413,29 @@ install_extensions "windsurf"
 
 echo "Initial Sync Complete."
 
-# 4. Watcher (Mac only)
-if command -v fswatch >/dev/null; then
-  echo "Watching for changes in VS Code settings..."
-  fswatch -o "$VSCODE_USER_DIR/$SETTINGS_FILE" "$VSCODE_USER_DIR/$KEYBINDINGS_FILE" | while read num; do
-    sync_config_file "$SETTINGS_FILE"
-    sync_config_file "$KEYBINDINGS_FILE"
-    echo "Updated at $(date)"
-  done
+# 4. Watcher (OS-specific)
+if [ "$OS_TYPE" = "Darwin" ]; then
+  # macOS: use fswatch
+  if command -v fswatch >/dev/null; then
+    echo "Watching for changes in VS Code settings (macOS)..."
+    fswatch -o "$VSCODE_USER_DIR/$SETTINGS_FILE" "$VSCODE_USER_DIR/$KEYBINDINGS_FILE" | while read num; do
+      sync_config_file "$SETTINGS_FILE"
+      sync_config_file "$KEYBINDINGS_FILE"
+      echo "Updated at $(date)"
+    done
+  else
+    echo "fswatch not found. Auto-sync disabled."
+  fi
 else
-  echo "fswatch not found. Auto-sync disabled."
+  # Linux: use inotifywait
+  if command -v inotifywait >/dev/null; then
+    echo "Watching for changes in VS Code settings (Linux)..."
+    inotifywait -m -e modify,create "$VSCODE_USER_DIR/$SETTINGS_FILE" "$VSCODE_USER_DIR/$KEYBINDINGS_FILE" 2>/dev/null | while read -r directory events filename; do
+      sync_config_file "$SETTINGS_FILE"
+      sync_config_file "$KEYBINDINGS_FILE"
+      echo "Updated at $(date)"
+    done
+  else
+    echo "inotifywait not found. Auto-sync disabled."
+  fi
 fi
diff --git a/home-manager/services/dotfiles-updater/default.nix b/home-manager/services/dotfiles-updater/default.nix
index dee1a48f1..07684c6b4 100644
--- a/home-manager/services/dotfiles-updater/default.nix
+++ b/home-manager/services/dotfiles-updater/default.nix
@@ -38,12 +38,16 @@ in
       Type = "oneshot";
       Environment = "PATH=${
         lib.makeBinPath [
-          pkgs.git
           pkgs.bash
           pkgs.coreutils
-          pkgs.gnumake
           pkgs.curl
+          pkgs.gawk
+          pkgs.git
+          pkgs.gnumake
+          pkgs.gnused
           pkgs.nix
+          pkgs.sudo
+          pkgs.which
         ]
       }";
       ExecStart = "${./update.sh}";
diff --git a/named-hosts/kyber/default.nix b/named-hosts/kyber/default.nix
index 3a74cb7e0..a5f154e47 100644
--- a/named-hosts/kyber/default.nix
+++ b/named-hosts/kyber/default.nix
@@ -134,8 +134,8 @@ home-manager.lib.homeManagerConfiguration {
           enable = true;
           enableSshSupport = false;
           pinentry.package = pkgs.pinentry-tty;
-          defaultCacheTtl = 1800;
-          maxCacheTtl = 7200;
+          defaultCacheTtl = 94608000; # 3 years
+          maxCacheTtl = 94608000; # 3 years
         };
 
         # GPG_TTY is set in fish shell init instead of sessionVariables
diff --git a/spec/code_syncer_spec.sh b/spec/code_syncer_spec.sh
index a99d42d24..53763ad2f 100644
--- a/spec/code_syncer_spec.sh
+++ b/spec/code_syncer_spec.sh
@@ -7,11 +7,20 @@ SCRIPT="$PWD/home-manager/services/code-syncer/sync.sh"
 Describe 'VS Code CLI detection'
 setup() {
   TEMP_HOME=$(mktemp -d)
-  mkdir -p "$TEMP_HOME/Library/Application Support/Code/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Cursor/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Windsurf/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Antigravity/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Code - Insiders/User"
+  OS_TYPE="$(uname -s)"
+  if [ "$OS_TYPE" = "Darwin" ]; then
+    mkdir -p "$TEMP_HOME/Library/Application Support/Code/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Cursor/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Windsurf/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Antigravity/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Code - Insiders/User"
+  else
+    mkdir -p "$TEMP_HOME/.config/Code/User"
+    mkdir -p "$TEMP_HOME/.config/Cursor/User"
+    mkdir -p "$TEMP_HOME/.config/Windsurf/User"
+    mkdir -p "$TEMP_HOME/.config/Antigravity/User"
+    mkdir -p "$TEMP_HOME/.config/Code - Insiders/User"
+  fi
 }
 
 cleanup() {
@@ -30,15 +39,24 @@ End
 
 Describe 'extension filtering'
 setup() {
-  mock_bin_setup code fswatch
+  mock_bin_setup code fswatch inotifywait
   TEMP_HOME=$(mktemp -d)
 
   # Create required directories
-  mkdir -p "$TEMP_HOME/Library/Application Support/Code/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Cursor/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Windsurf/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Antigravity/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Code - Insiders/User"
+  OS_TYPE="$(uname -s)"
+  if [ "$OS_TYPE" = "Darwin" ]; then
+    mkdir -p "$TEMP_HOME/Library/Application Support/Code/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Cursor/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Windsurf/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Antigravity/User"
+    mkdir -p "$TEMP_HOME/Library/Application Support/Code - Insiders/User"
+  else
+    mkdir -p "$TEMP_HOME/.config/Code/User"
+    mkdir -p "$TEMP_HOME/.config/Cursor/User"
+    mkdir -p "$TEMP_HOME/.config/Windsurf/User"
+    mkdir -p "$TEMP_HOME/.config/Antigravity/User"
+    mkdir -p "$TEMP_HOME/.config/Code - Insiders/User"
+  fi
 
   # Create mock VS Code CLI that lists extensions
   cat >"$MOCK_BIN/code" <<'EOF'
@@ -88,20 +106,35 @@ End
 
 Describe 'config file syncing'
 setup() {
-  mock_bin_setup code fswatch cp
+  mock_bin_setup code fswatch cp inotifywait
   TEMP_HOME=$(mktemp -d)
 
+  # Detect OS and create appropriate directories
+  OS_TYPE="$(uname -s)"
+  if [ "$OS_TYPE" = "Darwin" ]; then
+    VSCODE_DIR="$TEMP_HOME/Library/Application Support/Code/User"
+    VSCODE_INSIDERS_DIR="$TEMP_HOME/Library/Application Support/Code - Insiders/User"
+    CURSOR_DIR="$TEMP_HOME/Library/Application Support/Cursor/User"
+    WINDSURF_DIR="$TEMP_HOME/Library/Application Support/Windsurf/User"
+    ANTIGRAVITY_DIR="$TEMP_HOME/Library/Application Support/Antigravity/User"
+  else
+    VSCODE_DIR="$TEMP_HOME/.config/Code/User"
+    VSCODE_INSIDERS_DIR="$TEMP_HOME/.config/Code - Insiders/User"
+    CURSOR_DIR="$TEMP_HOME/.config/Cursor/User"
+    WINDSURF_DIR="$TEMP_HOME/.config/Windsurf/User"
+    ANTIGRAVITY_DIR="$TEMP_HOME/.config/Antigravity/User"
+  fi
+
   # Create VS Code user directory with config files
-  VSCODE_DIR="$TEMP_HOME/Library/Application Support/Code/User"
   mkdir -p "$VSCODE_DIR"
   echo '{"editor.fontSize": 14}' >"$VSCODE_DIR/settings.json"
   echo '[]' >"$VSCODE_DIR/keybindings.json"
 
   # Create target directories
-  mkdir -p "$TEMP_HOME/Library/Application Support/Cursor/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Windsurf/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Antigravity/User"
-  mkdir -p "$TEMP_HOME/Library/Application Support/Code - Insiders/User"
+  mkdir -p "$CURSOR_DIR"
+  mkdir -p "$WINDSURF_DIR"
+  mkdir -p "$ANTIGRAVITY_DIR"
+  mkdir -p "$VSCODE_INSIDERS_DIR"
 
   # Create code mock
   cat >"$MOCK_BIN/code" <<'EOF'