diff --git a/install.sh b/install.sh
index b6c1233..796e9d7 100755
--- a/install.sh
+++ b/install.sh
@@ -29,30 +29,20 @@ HOME_SYMLINKS_DST[0]=".ssh/authorized_keys2"
 install_dependencies()
 {
     fmt_note "installing dependencies ..."
-    case $(get_os_type) in
-        "linux" )
-            case $(get_linux_dist) in
-                "ubuntu"|"debian" )
-                    $SUDO apt-get update
-                    $SUDO apt-get install -y git zsh bash tmux vim curl inetutils-ping less bsdmainutils
-                    ;;
-                "alpine" )
-                    $SUDO apk update
-                    $SUDO apk add zsh bash git tmux vim curl fzf iputils coreutils util-linux
-                    ;;
-                * ) fmt_error "dfs auto-install is not implemented on linux distribution: $(get_linux_dist)"
-            esac
+    case $(get_os_name) in
+        "ubuntu"|"debian" )
+            DFS_LITE=$DFS_LITE $SUDO $DOTFILES/tools/ubuntu.sh apt-install
+            ;;
+        "alpine" )
+            DFS_LITE=$DFS_LITE $SUDO $DOTFILES/tools/alpine.sh apk-add
             ;;
         "macos" )
-            $SUDO brew update
-            $SUDO brew install git zsh curl tmux vim util-linux
+            DFS_LITE=$DFS_LITE $SUDO $DOTFILES/tools/macos.sh brew-install
             ;;
         "msys" )
-            pacman -Syu
-            pacman -S tmux git zsh bash curl vim
-            SUDO=""
+            DFS_LITE=$DFS_LITE $SUDO $DOTFILES/tools/msys2.sh pacman-S
             ;;
-        * ) fmt_error "dfs auto-install is not implemented on OS: $(get_os_type)"
+        * ) fmt_error "dfs auto-install is not implemented on OS: $(get_os_name)"
     esac
 }
 
diff --git a/tools/alpine.sh b/tools/alpine.sh
index 89442a4..59d81c2 100755
--- a/tools/alpine.sh
+++ b/tools/alpine.sh
@@ -12,9 +12,13 @@ apk_add()
 {
     apk update
 
-    # mass installation
-    apk add zsh git tmux vim curl wget bash python3 py3-pip htop gcc g++ cmake make fzf perl linux-headers bind-tools iputils man-db coreutils util-linux
-    #for i in {fzf,ripgrep}; do apk add $i -y; done
+    # lite
+    apk add zsh bash git tmux vim curl fzf iputils coreutils util-linux
+
+    # full
+    if [[ -z "$DFS_LITE" ]]; then
+        apk add wget python3 py3-pip htop gcc g++ cmake make perl linux-headers bind-tools man-db
+    fi
 }
 
 set_timezone()
diff --git a/tools/common.sh b/tools/common.sh
index 4288319..87fcdfa 100755
--- a/tools/common.sh
+++ b/tools/common.sh
@@ -172,7 +172,8 @@ apost_beacon()
     post_beacon "$@" 1>/dev/null &
 }
 
-get_os_type() {
+get_os_type()
+{
     local ans="unknown"
     case "$(uname -s)" in
         Darwin*)    ans="MacOS";;
@@ -184,7 +185,8 @@ get_os_type() {
     echo $ans | tr '[:upper:]' '[:lower:]'
 }
 
-get_linux_dist() {
+get_linux_dist()
+{
     local ans="unknown"
     if [ -f /etc/os-release ]; then
         . /etc/os-release
@@ -206,6 +208,15 @@ get_linux_dist() {
     echo $ans | tr '[:upper:]' '[:lower:]'
 }
 
+get_os_name()
+{
+    local ans=$(get_os_type)
+    if [[ "$ans" == "linux" ]]; then
+        ans=$(get_linux_dist)
+    fi
+    echo $ans
+}
+
 # if bash-ed, else source-d
 if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
     $1 "${@:2}"
diff --git a/tools/macos.sh b/tools/macos.sh
new file mode 100644
index 0000000..0edd212
--- /dev/null
+++ b/tools/macos.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+
+brew_install()
+{
+    brew update
+    brew install git zsh curl tmux vim util-linux
+}
+
+router()
+{
+    case $1 in
+        brew_install ) brew_install ;;
+        *            ) echo unknown command "$1". available: brew_install;;
+    esac
+}
+
+router $@
diff --git a/tools/msys2.sh b/tools/msys2.sh
index 48cc70d..00ed05d 100755
--- a/tools/msys2.sh
+++ b/tools/msys2.sh
@@ -13,7 +13,12 @@ set_mirror()
 pacman_S()
 {
     pacman -Syu
-    pacman -S tmux git zsh curl vim wget base-devel mingw-w64-x86_64-toolchain make cmake gcc zip unzip python3 python3-pip man-pages-posix
+    # lite
+    pacman -S tmux git zsh bash curl vim
+    # full
+    if [[ -z "$DFS_LITE" ]]; then
+        pacman -S wget base-devel mingw-w64-x86_64-toolchain make cmake gcc zip unzip python3 python3-pip man-pages-posix
+    fi
 }
 
 router()
diff --git a/tools/ubuntu.sh b/tools/ubuntu.sh
index e6a98cf..ef753e4 100755
--- a/tools/ubuntu.sh
+++ b/tools/ubuntu.sh
@@ -11,17 +11,15 @@ set_mirror()
 
 apt_install()
 {
-    # basic packages
-    apt-get update
-    for i in {man-db,vim,ca-certificates}; do apt-get install $i -y; done
+    apt-get update -y
 
     # lite
-    apt-get install -y git zsh bash tmux vim curl inetutils-ping less bsdmainutils
+    apt-get install -y git zsh bash tmux vim curl inetutils-ping less bsdmainutils ca-certificates
 
     # full
     if [[ -z "$DFS_LITE" ]]; then
         apt-get install wget dialog net-tools dnsutils netcat traceroute sudo python3 python3-pip cron openssh-client openssh-server htop gcc g++ cmake make zip
-        for i in {fzf,ripgrep}; do apt-get install -y $i; done
+        for i in {fzf,ripgrep,man-db}; do apt-get install -y $i; done
     fi
 }