diff --git a/configs/packages.nix b/configs/packages.nix
index d324f1f..f2796b1 100644
--- a/configs/packages.nix
+++ b/configs/packages.nix
@@ -94,6 +94,7 @@ with pkgs;
     maxima
     mypy
     nasm
+    nix-prefetch-git
     nodejs
     ocaml
     par
@@ -104,10 +105,10 @@ with pkgs;
     rustup
     scala
     seafile-client
+    shellcheck
     spotify
     swiProlog
     tinycc
     zeroad
   ];
-
 }
diff --git a/configs/shells.nix b/configs/shells.nix
index f252e88..4575055 100644
--- a/configs/shells.nix
+++ b/configs/shells.nix
@@ -4,6 +4,8 @@ in {
   environment.shellAliases =
     let rlwrap = cmd: "${pkgs.rlwrap}/bin/rlwrap ${cmd}";
     in {
+      o = "xdg-open";
+      n = "nix-shell";
       ":r" = ''echo "You stupid!"'';
       clipboard = "${pkgs.xclip}/bin/xclip -se c";
       external-ip = "${pkgs.dnsutils}/bin/dig +short myip.opendns.com @resolver1.opendns.com";