diff --git a/lib/utils.sh b/lib/utils.sh
index b2092ef..736f6f5 100644
--- a/lib/utils.sh
+++ b/lib/utils.sh
@@ -33,7 +33,7 @@
 
 ############ Testing if packages, apps, gems, etc. are installed ###############
 
-# if type_exists 'git'; then
+# if _omb_util_command_exists 'git'; then
 #   e_success "Git good to go"
 # else
 #   e_error "Git should be installed. It isn't. Aborting."
@@ -73,15 +73,24 @@
 ################################################################################
 
 _omb_version=10000
+_omb_bash_version=$((BASH_VERSINFO[0] * 10000 + BASH_VERSINFO[1] * 100 + BASH_VERSINFO[2]))
 
 function _omb_util_defun_print {
   builtin eval -- "function $1 { local $3; $2 \"\$@\" && printf '%s\n' \"\${$3}\"; }"
 }
 
+function __omb_util_defun_deprecate__message {
+  local old=$1 new=$2
+  local v=__omb_util_DeprecateFunction_$old; v=${v//[!a-zA-Z0-9_]/'_'}
+  [[ ${!v+set} ]] && return 0
+  printf 'warning (oh-my-bash): %s\n' "\`$old' is deprecated. Use \`$new'." >&2
+  printf -v "$v" done
+}
+
 function _omb_util_defun_deprecate {
   local warning=
   ((_omb_version>=$1)) &&
-    warning='echo "warning: \`$2'\'' is deprecated. Use \`$3'\''." >&2; '
+    warning='__omb_util_defun_deprecate__message "$2" "$3"; '
   builtin eval -- "function $2 { $warning$3 \"\$@\"; }"
 }
 
@@ -161,25 +170,47 @@ is_confirmed() {
 }
 
 #
-# Test whether a command is defined. Includes:
-#   alias (command is shell alias)
-#   keyword (command is shell reserved word)
-#   function (command is shell function)
-#   builtin (command is shell builtin)
-#   file (command is disk file)
+# Test whether a command---either an alias, a keyword, a function, a builtin,
+# or a file---is defined.
 #
 # $1 = cmd to test
-# Usage:
-# if type_exists 'git'; then
-#   some action
-# else
-#   some other action
-# fi
 #
-type_exists() {
-  [ "$(type -t "$1")" ]
+# Usage:
+#
+#   if _omb_util_command_exists 'git'; then
+#     some action
+#   else
+#     some other action
+#   fi
+#
+
+if ((_omb_bash_version >= 40000)); then
+  _omb_util_command_exists() {
+    type -t -- "$@" &>/dev/null # bash-4.0
+  }
+  _omb_util_binary_exists() {
+    type -P -- "$@" &>/dev/null # bash-4.0
+  }
+else
+  _omb_util_command_exists() {
+    while (($#)); do
+      type -t -- "$1" &>/dev/null || return 1
+      shift
+    done
+  }
+  _omb_util_binary_exists() {
+    while (($#)); do
+      type -P -- "$1" &>/dev/null || return 1
+      shift
+    done
+  }
+fi
+_omb_util_function_exists() {
+  declare -F "$@" &>/dev/null # bash-3.2
 }
 
+_omb_util_defun_deprecate 20000 type_exists _omb_util_binary_exists
+
 #
 # Test which OS the user runs
 # $1 = OS to test
diff --git a/oh-my-bash.sh b/oh-my-bash.sh
index a308386..47e0698 100644
--- a/oh-my-bash.sh
+++ b/oh-my-bash.sh
@@ -154,7 +154,7 @@ if [[ $PROMPT ]]; then
     export PS1="\["$PROMPT"\]"
 fi
 
-if ! type_exists '__git_ps1' ; then
+if ! _omb_util_command_exists '__git_ps1' ; then
   source "$OSH/tools/git-prompt.sh"
 fi
 
diff --git a/plugins/sdkman/sdkman.plugin.sh b/plugins/sdkman/sdkman.plugin.sh
index ed4e0c0..33ef0e9 100644
--- a/plugins/sdkman/sdkman.plugin.sh
+++ b/plugins/sdkman/sdkman.plugin.sh
@@ -4,6 +4,6 @@
 [[ ${SDKMAN_DIR-} ]] || export SDKMAN_DIR=~/.sdkman
 
 # Try to load sdk only if the command is not available
-if ! type_exists sdk && [[ -s $SDKMAN_DIR/bin/sdkman-init.sh ]]; then
+if ! _omb_util_command_exists sdk && [[ -s $SDKMAN_DIR/bin/sdkman-init.sh ]]; then
   source "$SDKMAN_DIR/bin/sdkman-init.sh"
 fi
diff --git a/plugins/zoxide/zoxide.plugin.sh b/plugins/zoxide/zoxide.plugin.sh
index c80b784..8cac422 100644
--- a/plugins/zoxide/zoxide.plugin.sh
+++ b/plugins/zoxide/zoxide.plugin.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 # Check if zoxide is installed
-if type_exists zoxide; then
+if _omb_util_command_exists zoxide; then
     eval "$(zoxide init bash)"
 else
     echo '[oh-my-bash] zoxide not found, please install it from https://github.com/ajeetdsouza/zoxide'
diff --git a/themes/base.theme.sh b/themes/base.theme.sh
index d5a0382..fc297b0 100644
--- a/themes/base.theme.sh
+++ b/themes/base.theme.sh
@@ -516,7 +516,7 @@ function battery_char {
     fi
 }
 
-if ! type_exists 'battery_charge' ; then
+if ! _omb_util_command_exists 'battery_charge' ; then
     # if user has installed battery plugin, skip this...
     function battery_charge (){
         # no op
@@ -526,7 +526,7 @@ fi
 
 # The battery_char function depends on the presence of the battery_percentage function.
 # If battery_percentage is not defined, then define battery_char as a no-op.
-if ! type_exists 'battery_percentage' ; then
+if ! _omb_util_command_exists 'battery_percentage' ; then
     function battery_char (){
       # no op
       echo -n
diff --git a/themes/powerline/powerline.base.sh b/themes/powerline/powerline.base.sh
index 346ae68..2786f51 100644
--- a/themes/powerline/powerline.base.sh
+++ b/themes/powerline/powerline.base.sh
@@ -43,9 +43,9 @@ function __powerline_user_info_prompt {
 function __powerline_ruby_prompt {
   local ruby_version=""
 
-  if type_exists 'rvm'; then
+  if _omb_util_command_exists 'rvm'; then
     ruby_version="$(rvm_version_prompt)"
-  elif type_exists 'rbenv'; then
+  elif _omb_util_command_exists 'rbenv'; then
     ruby_version=$(rbenv_version_prompt)
   fi