diff --git a/.gitignore b/.gitignore
index b2be92b..1574d4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 result
+.DS_Store
diff --git a/INSTALL b/INSTALL
index d05fb48..580e976 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,20 +1,26 @@
+### clone
 git clone --recurse-submodules git@github.com:zy9306/nix-home.git
 
-# install
+### INSTALL
+install
 # https://nixos.org/manual/nix/stable/installation/installation
 
 . $HOME/.nix-profile/etc/profile.d/nix.sh
 
-./__setup_nix.sh update_nix_channel
+### setup nix channel (Optional)
+nix-channel --list
+nix-channel --remove nixpkgs
+nix-channel --add https://mirrors.tuna.tsinghua.edu.cn/nix-channels/nixpkgs-unstable nixpkgs
+nix-channel --update
 
-./__setup_nix.sh install_cachix
+### setup cachix (Optional)
+nix-env -iA cachix -f https://cachix.org/api/v1/install
+cachix use arcueid
 
-# setup cache mirror
 # ~/.config/nix/nix.conf
 # substituters = https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store https://cache.nixos.org https://arcueid.cachix.org
 
+### INSTALL NIXPKGS
 ./install_nixpkgs.sh
 
 ./install_macos_extra.sh
-
-# ./install_dotfiles.sh
diff --git a/__setup_nix.sh b/__setup_nix.sh
deleted file mode 100755
index eba41b8..0000000
--- a/__setup_nix.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-
-update_nix_channel() {
-  echo ">>> update nix channel ..."
-  nix-channel --list
-  nix-channel --remove nixpkgs
-  nix-channel --add https://mirrors.tuna.tsinghua.edu.cn/nix-channels/nixpkgs-unstable nixpkgs
-  nix-channel --update
-}
-
-install_cachix() {
-  echo ">>> install cachix ..."
-  nix-env -iA cachix -f https://cachix.org/api/v1/install
-  cachix use arcueid
-}
-
-case "$1" in
-"update_nix_channel")
-  update_nix_channel
-  ;;
-"install_cachix")
-  install_cachix
-  ;;
-*)
-  echo -e "nothing to do"
-  ;;
-esac
diff --git a/install_locked.sh b/install_locked.sh
deleted file mode 100755
index a1de89c..0000000
--- a/install_locked.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env bash
-
-nix-env -iA bfg-repo-cleaner -f https://github.com/NixOS/nixpkgs/archive/30d3d79b7d3607d56546dd2a6b49e156ba0ec634.tar.gz
diff --git a/install_macos_extra.sh b/install_macos_extra.sh
index b2f0345..33d98db 100755
--- a/install_macos_extra.sh
+++ b/install_macos_extra.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-install="nix-env -iA pkgs"
+install="nix-env -iA nixpkgs"
 
 # macOS bsd tools to gnu.
 case "$(uname -s)" in
diff --git a/install_nixpkgs.sh b/install_nixpkgs.sh
index 2ac43c8..f5e8874 100755
--- a/install_nixpkgs.sh
+++ b/install_nixpkgs.sh
@@ -2,4 +2,5 @@
 
 nix-env -i -f nixpkgs.nix
 
-./install_locked.sh
+### locked pkgs
+nix-env -iA bfg-repo-cleaner -f https://github.com/NixOS/nixpkgs/archive/30d3d79b7d3607d56546dd2a6b49e156ba0ec634.tar.gz