diff --git a/fish/install.sh b/fish/install.sh
index 7597128..cb8b9ed 100755
--- a/fish/install.sh
+++ b/fish/install.sh
@@ -1,9 +1,11 @@
-#!/usr/bin/env bash
-# vim:set ft=bash:
+#!/usr/bin/env sh
 
-cd "$(dirname "${BASH_SOURCE[0]}")" \
-  && source "../homebrew/brew_utils.sh" \
-  && source "../script/utils.sh"
+DOT="${DOT:-$HOME/dotfiles}"
+
+# shellcheck source=../homebrew/brew_utils.sh
+. "$DOT/homebrew/brew_utils.sh"
+# shellcheck source=../script/utils.sh
+. "$DOT/script/utils.sh"
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 
@@ -11,15 +13,11 @@ brew_install "Fish Shell" "fish"
 
 fish_path="$(which fish)"
 
-if ! grep "$fish_path" < /etc/shells &> /dev/null; then
+if ! grep "$fish_path" < /etc/shells >/dev/null 2>&1; then
   execute \
     "printf '%s\n' '$fish_path' | sudo tee -a /etc/shells" \
     "Add '$fish_path' to '/etc/shells'"
 fi
 
-chsh -s "$fish_path" &> /dev/null
+chsh -s "$fish_path" >/dev/null 2>&1
 print_result $? "Make OS use Fish as the default shell"
-
-execute \
-  "curl -sL https://raw.githubusercontent.com/jorgebucaran/fisher/main/functions/fisher.fish | source && fisher install jorgebucaran/fisher" \
-  "Fisher"
diff --git a/script/bootstrap.sh b/script/bootstrap.sh
new file mode 100755
index 0000000..75d6b10
--- /dev/null
+++ b/script/bootstrap.sh
@@ -0,0 +1,258 @@
+#!/usr/bin/env sh
+
+readonly GITHUB_REPO="punkfairie/dotfiles"
+
+readonly DOTFILES_ORIGIN="git@github.com:$GITHUB_REPO.git"
+readonly DOTFILES_TARBALL="https://github.com/$GITHUB_REPO/tarball/main"
+readonly DOTFILES_UTILS="https://raw.githubusercontent.com/$GITHUB_REPO/main/scripts/utils.sh"
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+
+export DOT="$HOME/dotfiles" # MUST HAVE NO TRAILING SLASH!!
+yes_to_all=false
+
+################################################################################
+#                              Download Dotfiles                               #
+################################################################################
+
+download()
+{
+  url="$1"
+  output="$2"
+
+  if command -v "curl" >/dev/null 2>&1; then
+    curl \
+      --location \
+      --silent \
+      --show-error \
+      --output "$output" \
+      "$url" \
+      >/dev/null 2>&1
+
+    return $?
+
+  elif command -v "wget" >/dev/null 2>&1; then
+    wget \
+      --quiet \
+      --output-document="$output" \
+      "$url" \
+      >/dev/null 2>&1
+
+    return $?
+  fi
+
+  return 1
+}
+
+download_utils()
+{
+  tmp_file="$(mktemp /tmp/XXXXX)"
+
+  # shellcheck source=/dev/null
+  download "$DOTFILES_UTILS" "$tmp_file" \
+    && . "$tmp_file" \
+    && rm -rf "$tmp_file" \
+    && return 0
+
+  return 1
+}
+
+extract()
+{
+  archive="$1"
+  output_dir="$2"
+
+  if command -v "tar" >/dev/null 2>&1; then
+    tar \
+      --extract \
+      --gzip \
+      --file "$archive" \
+      --strip-components 1 \
+      --directory "$output_dir"
+
+    return $?
+  fi
+
+  return 1
+}
+
+download_dotfiles()
+{
+  print_title "Download and extract dotfiles archive"
+
+  tmp_file="$(mktemp /tmp/XXXXX)"
+
+  download "$DOTFILES_TARBALL" "$tmp_file"
+  print_result $? "Download archive" "true"
+  printf "\n"
+
+  if ! $yes_to_all; then
+
+    while [ -e "$DOT" ]; do
+      ask "'$DOT' already exists, do you want to (o)verwrite or (b)ackup the existing directory?"
+      answer="$(get_answer)"
+
+      case $answer in
+        o ) rm -rf "$DOT"; break;;
+        b ) mv "$DOT" "$DOT.bak"; break;;
+        * ) print_warning "Please enter a valid option."
+      esac
+
+    done
+
+  else
+    rm -rf "$DOT" >/dev/null 2>&1
+  fi
+
+  mkdir -p "$DOT"
+  print_result $? "Create '$DOT'" "true"
+
+  # Extract archive.
+  extract "$tmp_file" "$DOT"
+  print_result $? "Extract archive" "true"
+
+  rm -rf "$tmp_file"
+  print_result $? "Remove archive"
+
+  cd "$DOT/script" \
+    || return 1
+}
+
+################################################################################
+#                                    Xcode                                     #
+################################################################################
+
+are_xcode_cli_tools_installed()
+{
+  xcode-select --print-path >/dev/null 2>&1
+}
+
+install_xcode_cli_toools()
+{
+  if [ "$(uname)" = "Darwin" ]; then
+
+    print_title "Xcode"
+
+    xcode-select --install >/dev/null 2>&1
+
+    execute \
+      "until are_xcode_cli_tools_installed; do sleep 5; done" \
+      "Install Xcode Command Line Tools"
+
+    sudo xcodebuild -license accept >/dev/null 2>&1
+    print_result $? "Agree to the terms of the Xcode license"
+  fi
+}
+
+################################################################################
+#                               Setup Gitconfig                                #
+################################################################################
+
+setup_gitconfig()
+{
+  cd "$DOT" || return
+
+  if ! [ -f "$DOT/git/.gitconfig.local.symlink" ]; then
+    print_title "Set up gitconfig"
+
+    git_credential="cache"
+
+    if [ "$(uname)" = "Darwin" ]; then
+      git_credential="osxkeychain"
+    fi
+
+    print_question "What is your Github author name?"
+    read -r git_authorname
+
+    print_question "What is your Github author email?"
+    read -r git_authoremail
+
+    sed -e "s/AUTHORNAME/$git_authorname/g" \
+      -e "s/AUTHOREMAIL/$git_authoremail/g" \
+      -e "s/GIT_CREDENTIAL_HELPER/$git_credential/g" \
+      "$DOT/git/.gitconfig.local.symlink.example" > "$DOT/.gitconfig.local.symlink"
+
+    print_result $? "gitconfig"
+  fi
+}
+
+################################################################################
+#                             Initialize Git Repo                              #
+################################################################################
+
+git_init()
+{
+  print_title "Initialize Git repository"
+
+  if [ -z "$DOTFILES_ORIGIN" ]; then
+    print_error "Please provide a URL for the Git origin"
+    return 1
+  fi
+
+  if ! is_git_repository; then
+    cd "$DOT" || print_error "Failed to cd $DOT"
+
+    execute \
+      "git init && git remote add origin $DOTFILES_ORIGIN" \
+      "Initialize the dotfiles Git repository"
+  fi
+}
+
+################################################################################
+#                                     Main                                     #
+################################################################################
+
+main()
+{
+  if [ "$(uname)" != "Linux" ] && [ "$(uname)" != "Darwin" ]; then
+    printf "Sorry, this script is intended only for macOS and Ubuntu!"
+    return 1
+  fi
+
+  # Load utils.
+
+  if [ -x "${DOT}/script/utils.sh" ]; then
+    . "${DOT}/script/utils.sh" || exit 1
+  else
+    download_utils || exit 1
+  fi
+
+  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+  skip_questions "$@" \
+    && yes_to_all=true
+
+  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+  
+  ask_for_sudo
+
+  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+  
+  # Check if this script was run directly, and if not, dotfiles will need to be
+  # downloaded.
+
+  printf "%s" "$(sh_source "$0")" | grep "bootstrap.sh" >/dev/null 2>&1 \
+    || download_dotfiles
+
+  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+  
+  setup_gitconfig
+
+  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+  
+  install_xcode_cli_toools
+
+  "$DOT/homebrew/brew.sh"
+
+  "$DOT/fish/install.sh"
+
+  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+  if cmd_exists "git"; then
+    if [ "$(git config --get remote.origin.url)" != "$DOTFILES_ORIGIN" ]; then
+      git_init
+    fi
+  fi
+}
+
+main "$@"
diff --git a/script/dot b/script/dot
new file mode 100644
index 0000000..c02e6cd
--- /dev/null
+++ b/script/dot
@@ -0,0 +1,119 @@
+#!/usr/bin/env fish
+# vim:set ft=fish :
+
+set -q DOT || set -gx DOT "$HOME/dotfiles"
+
+source "$DOT/script/utils"
+
+################################################################################
+#                                OS Preferences                                #
+################################################################################
+
+function set_os_prefs
+  print_title "OS Preferences"
+
+  set os $(uname | string lower)
+
+  "$DOT/os/$os.fish"
+end
+
+################################################################################
+#                               Symlink Dotfiles                               #
+################################################################################
+
+function link_file
+  set -f src $argv[1]
+  set -f dst $argv[2]
+
+  set -f overwrite false
+  set -f backup false
+  set -f skip false
+  set -f action
+
+  if [ -f "$dst" ] || [ -d "$dst" ] || [ -L "$dst" ]
+    
+    if ! $overwrite_all && ! $backup_all && ! $skip_all
+      set -f current_src (readlink "$dst")
+
+      if [ "$current_src" = "$src" ]
+        set skip true
+      else
+        print_question "File already exists: $dst ($(basename $src)), what do you want to do?\n([s]kip, [S]kip all, [o]verwrite, [O]verwrite all, [b]ackup, [B]ackup all)"
+        read -n 1 action
+
+        switch $action
+          case o
+            set overwrite true
+          case O
+            set overwrite_all true
+          case b
+            set backup true
+          case B
+            set backup_all true
+          case s
+            set skip true
+          case S
+            set skip_all true
+        end
+      end
+    end
+
+    set -q overwrite || set overwrite $overwrite_all
+    set -q backup || set backup $backup_all
+    set -q skip || set skip $skip_all
+
+    if $overwrite
+      rm -rf "$dst"
+      print_success "Removed $dst"
+    end
+
+    if $backup
+      mv "$dst" "{$dst}.bak"
+      print_success "Moved $dst to {$dst}.bak"
+    end
+
+    if $skip
+      print_success "Skipped $src"
+    end
+  end
+
+  if ! $skip
+    # See of any directories need to be created.
+    if echo "$dst" | grep -q '/' 2> /dev/null
+      mkdir -p (string replace -r '\/[^\/]+$' '' "$dst")
+    end
+
+    ln -s "$src" "$dst"
+    print_success "Linked $src to $dst"
+  end
+end
+
+function make_dst
+  set -l path (string escape --style=regex "$DOT")
+  set -l regex (string join '^\/' $path '\/[a-zA-Z]+\/(.+)\.symlink$')
+  set -l dst (string replace -r $regex '$1' "$argv[1]")
+
+  printf '%s' "$dst"
+end
+
+function install_dotfiles
+  print_title "Installing Dotfiles"
+
+  set -g overwrite_all false
+  set -g backup_all false
+  set -g skip_all false
+
+  find -H "$DOT" -name "*.symlink" -not -path ".git" | \
+    while read -l -t src; link_file "$src" "$(make_dst $src)"; end
+end
+
+################################################################################
+#                                     Main                                     # 
+################################################################################
+
+print_title "Installers"
+find . -name install.fish | while read installer; fish -c "$installer"; end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+install_dotfiles
diff --git a/script/dot.sh b/script/dot.sh
deleted file mode 100755
index 11b0537..0000000
--- a/script/dot.sh
+++ /dev/null
@@ -1,384 +0,0 @@
-#!/usr/bin/env bash
-# vim:set ft=bash:
-
-declare -r GITHUB_REPO="punkfairie/dotfiles"
-
-declare -r DOTFILES_ORIGIN="git@github.com:$GITHUB_REPO.git"
-declare -r DOTFILES_TARBALL="https://github.com/$GITHUB_REPO/tarball/main"
-declare -r DOTFILES_UTILS="https://raw.githubusercontent.com/$GITHUB_REPO/main/scripts/utils.sh"
-
-# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
-
-declare dotfiles_dir="$HOME/dotfiles" # MUST HAVE NO LEADING SLASH!!
-declare yes_to_all=false
-
-################################################################################
-#                              Download Dotfiles                               #
-################################################################################
-
-download()
-{
-  local url="$1"
-  local output="$2"
-
-  if command -v "curl" &> /dev/null; then
-    curl \
-      --location \
-      --silent \
-      --show-error \
-      --output "$output" \
-      "$url" \
-      &> /dev/null
-
-    return $?
-
-  elif command -v "wget" &> /dev/null; then
-    wget \
-      --quiet \
-      --output-document="$output" \
-      "$url" \
-      &> /dev/null
-
-    return $?
-  fi
-
-  return 1
-}
-
-download_utils()
-{
-  local tmp_file=""
-
-  tmp_file="$(mktemp /tmp/XXXXX)"
-
-  download "$DOTFILES_UTILS" "$tmp_file" \
-    && . "$tmp_file" \
-    && rm -rf "$tmp_file" \
-    && return 0
-
-  return 1
-}
-
-extract()
-{
-  local archive="$1"
-  local output_dir="$2"
-
-  if command -v "tar" &> /dev/null; then
-    tar \
-      --extract \
-      --gzip \
-      --file "$archive" \
-      --strip-components 1 \
-      --directory "$output_dir"
-
-    return $?
-  fi
-
-  return 1
-}
-
-download_dotfiles()
-{
-  local tmp_file=""
-
-  print_title "Download and extract dotfiles archive"
-
-  tmp_file="$(mktemp /tmp/XXXXX)"
-
-  download "$DOTFILES_TARBALL" "$tmp_file"
-  print_result $? "Download archive" "true"
-  printf "\n"
-
-  if ! $yes_to_all; then
-
-    while [[ -e $dotfiles_dir ]]; do
-      ask "'$dotfiles_dir' already exists, do you want to (o)verwrite or (b)ackup the existing directory?"
-      answer="$(get_answer)"
-
-      case $answer in
-        o ) rm -rf "$dotfiles_dir"; break;;
-        b ) mv "$dotfiles_dir" "$dotfiles_dir.bak"; break;;
-        * ) print_warning "Please enter a valid option."
-      esac
-
-    done
-
-  else
-    rm -rf "$dotfiles_dir" &> /dev/null
-  fi
-
-  mkdir -p "$dotfiles_dir"
-  print_result $? "Create '$dotfiles_dir'" "true"
-
-  # Extract archive.
-  extract "$tmp_file" "$dotfiles_dir"
-  print_result $? "Extract archive" "true"
-
-  rm -rf "$tmp_file"
-  print_result $? "Remove archive"
-
-  cd "$dotfiles_dir/script" \
-    || return 1
-}
-
-################################################################################
-#                                    Xcode                                     #
-################################################################################
-
-are_xcode_cli_tools_installed()
-{
-  xcode-select --print-path &> /dev/null
-}
-
-install_xcode_cli_toools()
-{
-  if [[ "$(uname)" == "Darwin" ]]; then
-
-    print_title "Xcode"
-
-    xcode-select --install &> /dev/null
-
-    execute \
-      "until are_xcode_cli_tools_installed; do sleep 5; done" \
-      "Install Xcode Command Line Tools"
-
-    sudo xcodebuild -license accept &> /dev/null
-    print_result $? "Agree to the terms of the Xcode license"
-  fi
-}
-
-################################################################################
-#                               Setup Gitconfig                                #
-################################################################################
-
-setup_gitconfig()
-{
-  cd "$dotfiles_dir"
-
-  if ! [[ -f $dotfiles_dir/git/.gitconfig.local.symlink ]]; then
-    print_title "Set up gitconfig"
-
-    git_credential="cache"
-
-    if [[ "$(uname)" == "Darwin" ]]; then
-      git_credential="osxkeychain"
-    fi
-
-    print_question "What is your Github author name?"
-    read -e git_authorname
-
-    print_question "What is your Github author email?"
-    read -e git_authoremail
-
-    sed -e "s/AUTHORNAME/$git_authorname/g" \
-      -e "s/AUTHOREMAIL/$git_authoremail/g" \
-      -e "s/GIT_CREDENTIAL_HELPER/$git_credential/g" \
-      $dotfiles_dir/git/.gitconfig.local.symlink.example > $dotfiles_dir/.gitconfig.local.symlink
-
-    print_result $? "gitconfig"
-  fi
-}
-
-################################################################################
-#                               Install Dotfiles                               #
-################################################################################
-
-link_file()
-{
-  local src=$1
-  local dst=$2
-
-  local overwrite=
-  local backup=
-  local skip=
-  local action=
-
-  if [ -f "$dst" -o -d "$dst" -o -L "$dst" ]; then
-    
-    if ! $overwrite_all && ! $backup_all && ! $skip_all; then
-      local current_src="$(readlink $dst)"
-
-      if [[ "$current_src" == "$src" ]]; then
-        skip=true
-
-      else
-        print_question "File already exists: $dst ($(basename "$src")), what do you want to do?\n\
-          [s]kip, [S]kip all, [o]verwrite, [O]verwrite all, [b]ackup, [B]ackup all?"
-        read -n 1 action
-
-        case "$action" in
-          o ) overwrite=true ;;
-          O ) overwrite_all=true ;;
-          b ) backup=true ;;
-          B ) backup_all=true ;;
-          s ) skip=true ;;
-          S ) skip_all=true ;;
-          * ) ;;
-        esac
-      fi
-    
-    fi
-
-    overwrite=${overwrite:-$overwrite_all}
-    backup=${backup:-$backup_all}
-    skip=${skip:-$skip_all}
-    
-    if $overwrite; then
-      rm -rf "$dst"
-      print_success "Removed $dst"
-    fi
-
-    if $backup; then
-      mv "$dst" "${dst}.bak"
-      print_success "Moved $dst to ${dst}.bak"
-    fi
-
-    if $skip; then
-      print_success "Skipped $src"
-    fi
-
-  fi
-
-  if [[ $skip != "true" ]]; then # "false" or empty
-
-    # See if any directories need to be created
-    if [[ "$dst" =~ '/' ]]; then
-      mkdir -p "${dst%/*}"
-    fi
-
-    ln -s "$src" "$dst"
-    print_success "Linked $src to $dst"
-  fi
-}
-
-install_dotfiles()
-{
-  print_title "Installing dotfiles"
-
-  local overwrite_all=false
-  local backup_all=false
-  local skip_all=false
-
-  for src in $(find -H "$dotfiles_dir" -maxdepth 5 -name "*.symlink" -not -path ".git"); do
-    dst="${src%.*}"
-    dst="${dst#$dotfiles_dir/}"
-    dst="${dst#*/}"
-    dst="$HOME/$dst"
-    link_file "$src" "$dst"
-  done
-}
-
-################################################################################
-#                             Initialize Git Repo                              #
-################################################################################
-
-git_init()
-{
-  print_title "Initialize Git repository"
-
-  if [[ -z "$DOTFILES_ORIGIN" ]]; then
-    print_error "Please provide a URL for the Git origin"
-    return 1
-  fi
-
-  if ! is_git_repository; then
-    cd $dotfiles_dir || print_error "Failed to cd $dotfiles_dir"
-
-    execute \
-      "git init && git remote add origin $DOTFILES_ORIGIN" \
-      "Initialize the dotfiles Git repository"
-  fi
-}
-
-################################################################################
-#                                  Restart OS                                  #
-################################################################################
-
-restart_os()
-{
-  print_title "Restart"
-
-  ask_for_confirmation "Do you want to restart?"
-  printf "\n"
-
-  if answer_is_yes; then
-    sudo shutdown -r now &> /dev/null
-  fi
-}
-
-################################################################################
-#                                     Main                                     #
-################################################################################
-
-main()
-{
-  if [[ "$(uname)" != "Linux" ]] && [[ "$(uname)" != "Darwin" ]]; then
-    printf "Sorry, this script is intended only for macOS and Ubuntu!"
-    return 1
-  fi
-
-  # Load utils.
-
-  if [[ -x "${dotfiles_dir}/script/utils.sh" ]]; then
-    . "${dotfiles_dir}/script/utils.sh" || exit 1
-  else
-    download_utils || exit 1
-  fi
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-  skip_questions "$@" \
-    && yes_to_all=true
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  ask_for_sudo
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  # Check if this script was run directly, and if not, dotfiles will need to be
-  # downloaded.
-
-  printf "%s" "${BASH_SOURCE[0]}" | grep "dot.sh" &> /dev/null \
-    || download_dotfiles
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  setup_gitconfig
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  install_dotfiles
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  $dotfiles_dir/os/pref.sh
-
-  install_xcode_cli_toools
-
-  $dotfiles_dir/homebrew/brew.sh
-
-  $dotfiles_dir/node/volta.sh
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  print_title "Installers"
-  find . -name install.sh | while read installer ; do sh -c "${installer}" ; done
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  if cmd_exists "git"; then
-    if [[ "$(git config --get remote.origin.url)" != "$DOTFILES_ORIGIN" ]]; then
-      git_init
-    fi
-  fi
-
-  # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-  
-  if ! $yes_to_all; then
-    restart_os
-  fi
-}
-
-main "$@"
diff --git a/script/utils b/script/utils
new file mode 100644
index 0000000..710e206
--- /dev/null
+++ b/script/utils
@@ -0,0 +1,141 @@
+#!/usr/bin/env fish
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+
+function print_in_color
+  printf '%b' \
+    "$(tput setaf $argv[2] 2> /dev/null)" \
+    $argv[1] \
+    "$(tput sgr0 2> /dev/null)"
+end
+
+function print_in_red
+  print_in_color $argv[1] 1
+end
+
+function print_in_yellow
+  print_in_color $argv[1] 3
+end
+
+function print_in_green
+  print_in_color $argv[1] 2
+end
+
+function print_in_purple
+  print_in_color $argv[1] 5
+end
+
+function print_title
+  print_in_purple "\n • $argv[1]\n\n"
+end
+
+function print_success
+  print_in_green "   [✔] $argv[1]\n"
+end
+
+function print_warning
+  print_in_yellow "   [!] $argv[1]\n"
+end
+
+function print_error
+  print_in_red "   [✖] $argv[1] $argv[2]\n"
+end
+
+function print_question
+  print_in_yellow "   [?] $argv[1]\n"
+end
+
+function print_result
+  if [ "$argv[1]" -eq 0 ]
+    print_success $argv[2]
+  else
+    print_error $argv[2]
+  end
+
+  return $argv[1]
+end
+
+function print_error_stream
+  while read -r line
+    print_error "↳ ERROR: $line"
+  end
+end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+
+function show_spinner
+  set -l frames '/-\|'
+
+  set -l number_of_frames (string length $FRAMES)
+
+  set -l pid $argv[1]
+  set -l cmds $argv[2]
+  set -l msg $argv[3]
+
+  set -l i 0
+  set -l frame_text ""
+
+  printf "\n\n\n"
+  tput cuu 3
+  tput sc
+
+  while kill -0 "$pid" &> /dev/null
+    set i math $i + 1
+    set -l num math % $number_of_frames
+    set -l frame (string sub -s $num -l 1)
+    set frame_text " [$frame] $msg"
+
+    printf '%s' $frame_text
+
+    sleep 0.2
+
+    tput rc
+  end
+end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+
+function set_trap
+  trap -p "$argv[1]" | grep "$argv[2]" &> /dev/null \
+    || trap "$argv[2]" "$argv[1]"
+end
+
+function kill_all_subproccesses
+  set -l i ""
+
+  for i in (jobs -p)
+    kill "$i"
+    wait "$i" &> /dev/null
+  end
+end
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+
+function execute
+  set -l cmds $argv[1]
+  set -q $argv[2] and set -l msg $argv[2] or set -l msg $argv[1]
+
+  set -l tmp_file "$(mktmp /tmp/XXXXX)"
+
+  set -l exit_code 0
+
+  set_trap 'EXIT' 'kill_all_subproccesses'
+
+  eval "$cmds" &> /dev/null 2> $tmp_file &
+  set cmds_pid $last_pid
+
+  show_spinner $cmds_pid $cmds $msg
+
+  wait $cmds_pid &> /dev/null
+  set exit_code $status
+
+  print_result $exit_code $msg
+
+  if [ $exit_code -ne 0 ]
+    print_error_stream < $tmp_file
+  end
+
+  rm -rf "$tmp_file"
+
+  return $exit_code
+end
diff --git a/script/utils.sh b/script/utils.sh
index 62319e7..0a4806c 100755
--- a/script/utils.sh
+++ b/script/utils.sh
@@ -1,5 +1,4 @@
-#!/usr/bin/env bash
-# vim:set ft=bash:
+#!/usr/bin/env sh
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 
@@ -21,7 +20,7 @@ skip_questions()
 
 ask_for_sudo()
 {
-  sudo -v &> /dev/null
+  sudo -v >/dev/null 2>&1
 
   # Update existing 'sudo' timestamp until this script has finished.
   #
@@ -31,7 +30,7 @@ ask_for_sudo()
     sudo -n true
     sleep 60
     kill -0 "$$" || exit
-  done &> /dev/null &
+  done >/dev/null 2>&1 &
 }
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
@@ -93,7 +92,7 @@ print_question()
 
 print_result()
 {
-  if [[ "$1" == 0 ]]; then
+  if [ "$1" = 0 ]; then
     print_success "$2"
   else
     print_error "$2"
@@ -110,6 +109,17 @@ print_error_stream()
 }
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 
+# https://stackoverflow.com/a/32270158
+# POSIX read -n 1
+# Usage: var="$(read_char)"
+read_char()
+{
+  old=$(stty -g)
+  stty raw -echo min 0
+  printf '%s' "$(dd bs=1 count=1 2>/dev/null)"
+  stty "$old"
+}
+
 ask()
 {
   print_question "$1"
@@ -124,32 +134,29 @@ get_answer()
 ask_for_confirmation()
 {
   print_question "$1 (y/n) "
-  read -r -n 1
+  REPLY="$(read_char)"
   printf "\n"
 }
 
 answer_is_yes()
 {
-  [[ "$REPLY" =~ ^[Yy]$ ]] \
-    && return 0 \
-    || return 1
+  expr "$REPLY" : '[Yy]$'
 }
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 
 show_spinner()
 {
-  local -r FRAMES='/-\|'
+  readonly FRAMES='/-\|'
 
-  # shellcheck disable=SC2034
-  local -r NUMBER_OF_FRAMES=${#FRAMES}
+  readonly NUMBER_OF_FRAMES=${#FRAMES}
 
-  local -r CMDS="$2"
-  local -r MSG="$3"
-  local -r PID="$1"
+  readonly CMDS="$2"
+  readonly MSG="$3"
+  readonly PID="$1"
 
-  local i=0
-  local frame_text=""
+  i=0
+  frame_text=""
 
   # Provide more space so that the text hopefully doesn't reach the bottom line
   # of the terminal window.
@@ -163,8 +170,11 @@ show_spinner()
   tput cuu 3
   tput sc
 
-  while kill -0 "$PID" &> /dev/null; do
-    frame_text=" [${FRAMES:i++%NUMBER_OF_FRAMES:1}] $MSG"
+  while kill -0 "$PID" >/dev/null 2>&1; do
+    i=$((i+1))
+    num=$((i % NUMBER_OF_FRAMES))
+    frame="$(echo $FRAMES | cut -c ${num}-$((num + 1)))"
+    frame_text=" [$frame] $MSG"
 
     # Print frame text.
     printf "%s" "$frame_text"
@@ -180,40 +190,87 @@ show_spinner()
 
 cmd_exists()
 {
-  command -v "$1" &> /dev/null
+  command -v "$1" >/dev/null 2>&1
 }
 
 is_git_repository()
 {
-  git rev-parse &> /dev/null
+  git rev-parse >/dev/null 2>&1
+}
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
+
+# https://stackoverflow.com/a/29835459
+# POSIX compliant way of finding BASH_SOURCE
+# Usage: sh_source "$0"
+rreadlink()
+(
+  target=$1
+  fname=
+  targetDir=
+  CDPATH=
+
+  { \unalias command; \unset-f command; } >/dev/null 2>&1
+  # shellcheck disable=SC2034
+  [ -n "$ZSH_VERSION" ] && options[POSIX_BUILTINS]=on
+
+  while :; do
+    [ -L "$target" ] || [ -e "$target" ] || { command printf '%s\n' "ERROR: $target does not exist." >&2; return 1; }
+    # shellcheck disable=SC2164
+    command cd "$(command dirname -- "$target")"
+    fname=$(command basename -- "$target")
+    [ "$fname" = '/' ] && fname=''
+    
+    if [ -L "$fname" ]; then
+      target=$(command ls -l "$fname")
+      target=${target#* -> }
+      continue
+    fi
+    
+    break
+  done
+
+  targetDir=$(command pwd -P)
+  if [ "$fname" = '.' ]; then
+    command printf '%s\n' "${targetDir%/}"
+  elif [ "$fname" = '..' ]; then
+    command printf '%s\n' "${targetDir%/}/$fname"
+  fi
+)
+
+sh_source()
+{
+  printf '%s' "$(dirname -- "$(rreadlink "$1")")"
 }
 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 
 set_trap()
 {
-  trap -p "$1" | grep "$2" &> /dev/null \
+  trap | grep "'$2' $1" >/dev/null 2>&1 \
     || trap '$2' "$1"
 }
 
 kill_all_subproccesses()
 {
-  local i=""
+  i=""
 
   for i in $(jobs -p); do
     kill "$i"
-    wait "$i" &> /dev/null
+    wait "$i" >/dev/null 2>&1
   done
 }
 
 execute()
 {
-  local -r CMDS="$1"
-  local -r MSG="${2:-$1}"
-  local -r TMP_FILE="$(mktemp /tmp/XXXXX)"
+  readonly CMDS="$1"
+  readonly MSG="${2:-$1}"
 
-  local exit_code=0
-  local cmds_pid=""
+  readonly TMP_FILE
+  TMP_FILE="$(mktemp /tmp/XXXXX)"
+
+  exit_code=0
+  cmds_pid=""
 
   # If the current process is ended, also end all its subproccesses.
   set_trap "EXIT" "kill_all_subproccesses"
@@ -221,7 +278,7 @@ execute()
   # Execute commands in background
   # shellcheck disable=SC2261
   eval "$CMDS" \
-    &> /dev/null \
+    >/dev/null 2>&1 \
     2> "$TMP_FILE" &
 
   cmds_pid=$!
@@ -231,13 +288,13 @@ execute()
 
   # Wait for the commands to no longer be executing in the background, and then
   # get their exit code.
-  wait "$cmds_pid" &> /dev/null
+  wait "$cmds_pid" >/dev/null 2>&1
   exit_code=$?
 
   # Print output based on what happened.
   print_result $exit_code "$MSG"
 
-  if [[ $exit_code -ne 0 ]]; then
+  if [ $exit_code -ne 0 ]; then
     print_error_stream < "$TMP_FILE"
   fi