diff --git a/README.md b/README.md
index 12b6944..354b935 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,13 @@ mar does dotfiles
 
 # post install
 
+## Casks
+
+```fish
+open /usr/local/Caskroom/windscribe/[#.#.#]/windscribeInstaller.app
+
+```
+
 ## iTerm2
 
 Set iTerm2 to use the preferences folder ~/dotfiles/os/.
diff --git a/os/apt_utils.fish b/os/apt_utils.fish
new file mode 100644
index 0000000..6fb0b76
--- /dev/null
+++ b/os/apt_utils.fish
@@ -0,0 +1,53 @@
+#!/usr/bin/env fish
+
+source "$DOT/script/utils.fish"
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+function package_is_installed -a pkg
+  dpkg -s "$pkg" &>/dev/null
+end
+
+function install_package -a pkg_readable_name pkg args
+  if ! package_is_installed "$pkg"
+    execute \
+      "sudo apt-get install --allow-authenticated -qqy $args $pkg" "$pkg_readable_name"
+      #                            suppress output ─┘│
+      #  assume "yes" as the answer to all prompts ──┘
+  else
+    print_success "$pkg_readable_name"
+  end
+end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+function add_key -a key
+  wget -q0 - "$key" | sudo apt-key add - &> /dev/null
+  #     │└─ write output to file
+  #     └─ don't show output
+end
+
+function add_ppa -a ppa
+  sudo add-apt-repository -y ppa:"$ppa" &>/dev/null
+end
+
+function add_to_source_list -a source list
+  sudo sh -c "printf 'deb $source' >> '/etc/apt/sources.list.d/$list'"
+end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+function apt_update
+  execute "sudo apt-get update -qqy" "APT (update)"
+end
+
+function apt_upgrade
+  execute \
+    "export DEBIAN_FRONTEND=\"noninteractive\" \
+      && sudo apt-get -o Dpkg::Options::=\"--force-confnew\" upgrade -qqy" \
+    "APT (upgrade)"
+end
+
+function apt_autoremove
+  execute "sudo apt-get autoremove -qqy" "APT (autoremove)"
+end
diff --git a/os/install.fish b/os/install.fish
new file mode 100644
index 0000000..b4da2f4
--- /dev/null
+++ b/os/install.fish
@@ -0,0 +1,31 @@
+#!/usr/bin/env fish
+
+source "$DOT/script/utils.fish"
+source "$DOT/homebrew/brew_utils.fish"
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+print_subtitle "OS"
+
+if [ "$(uname)" = "Darwin" ]
+  brew_install "mas-cli" "mas"
+
+  brew_install "Rectangle" "rectangle" "--cask"
+  execute "mas install 1563735522" "Charmstone"
+
+  brew_install "Windscribe" "windscribe" "--cask"
+  brew_install "Firefox" "firefox" "--cask"
+  brew_install "qBittorrent" "qbittorrent" "--cask"
+
+  brew_install "Discord" "discord" "--cask"
+  brew_install "BetterDiscord" "betterdiscord-installer" "--cask"
+
+  brew_install "Obsidian" "obsidian" "--cask"
+  brew_install "Fantastical" "fantastical" "--cask"
+
+  brew_install "iTerm2" "iterm2" "--cask"
+  brew_install "Laravel Herd" "herd" "--cask"
+  brew_install "DBngin" "dbngin" "--cask"
+  brew_install "PhpStorm" "phpstorm" "--cask"
+  brew_install "WebStorm" "webstorm" "--cask"
+end
diff --git a/os/pref.sh b/os/macos.fish
similarity index 100%
rename from os/pref.sh
rename to os/macos.fish
diff --git a/php/install.fish b/php/install.fish
new file mode 100644
index 0000000..b50106b
--- /dev/null
+++ b/php/install.fish
@@ -0,0 +1,11 @@
+#!/usr/bin/env fish
+
+source "$DOT/script/utils.fish"
+source "$DOT/homebrew/brew_utils.fish"
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+if [ "$(uname)" = "Darwin" ]
+  brew_install "Laravel Herd" "herd" "--cask"
+  brew_install "PhpStorm" "phpstorm" "--cask"
+end
diff --git a/script/dot.fish b/script/dot.fish
index 4b3d01f..92cd6c7 100755
--- a/script/dot.fish
+++ b/script/dot.fish
@@ -1,8 +1,9 @@
 #!/usr/bin/env fish
-# vim:set ft=fish :
 
 set -q DOT || set -gx DOT "$HOME/dotfiles"
 
+set -g yes_to_all false
+
 source "$DOT/script/utils.fish"
 
 ################################################################################
@@ -106,9 +107,23 @@ end
 function install_dotfiles
   print_title "Installing Dotfiles"
 
+  set -g skip_all false
   set -g overwrite_all false
   set -g backup_all false
-  set -g skip_all false
+
+  if set -q yes_to_all && $yes_to_all
+    set skip_all true
+  else if set -q _flag_s
+    set skip_all true
+  end
+
+  if set -q _flag_o
+    set overwrite_all true
+  end
+
+  if set -q _flag_b
+    set backup_all true
+  end
 
   set -l path (string replace -a '/' '\/' "$DOT")
   set -l regex (string join '' '^' "$path" '\/[a-zA-Z]+\/(.+)\.(sym|hard)link$')
@@ -119,9 +134,17 @@ function install_dotfiles
 end
 
 ################################################################################
-#                                     Main                                     # 
+#                                     Main                                     #
 ################################################################################
 
+argparse "y/yes-to-all" "s/skip" "o/overwrite" "b/backup" -- $argv
+
+if set -q _flag_y
+  set yes_to_all true
+end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
 # Ensure npm is available.
 
 "$DOT/node/volta.fish"