diff --git a/themes/90210/90210.theme.bash b/themes/90210/90210.theme.bash
new file mode 100644
index 00000000..e683e0ef
--- /dev/null
+++ b/themes/90210/90210.theme.bash
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+SCM_THEME_PROMPT_DIRTY=" ${red}✗"
+SCM_THEME_PROMPT_CLEAN=" ${bold_green}✓"
+SCM_THEME_PROMPT_PREFIX=" |"
+SCM_THEME_PROMPT_SUFFIX="${green}|"
+
+GIT_THEME_PROMPT_DIRTY=" ${red}✗"
+GIT_THEME_PROMPT_CLEAN=" ${bold_green}✓"
+GIT_THEME_PROMPT_PREFIX=" ${green}|"
+GIT_THEME_PROMPT_SUFFIX="${green}|"
+
+# Nicely formatted terminal prompt
+function prompt_command(){
+  export PS1="\n${bold_black}[${blue}\@${bold_black}]-${bold_black}[${green}\u${yellow}@${green}\h${bold_black}]-${bold_black}[${purple}\w${bold_black}]-$(scm_prompt_info)\n${reset_color}\$ "
+}
+
+safe_append_prompt_command prompt_command
diff --git a/themes/base.theme.bash b/themes/base.theme.bash
index 6d114363..2a567f3c 100644
--- a/themes/base.theme.bash
+++ b/themes/base.theme.bash
@@ -464,11 +464,22 @@ function aws_profile {
 }
 
 function safe_append_prompt_command {
-    if [[ -n $1 ]] ; then
-        case $PROMPT_COMMAND in
-            *$1*) ;;
-            "") PROMPT_COMMAND="$1";;
-            *) PROMPT_COMMAND="$1;$PROMPT_COMMAND";;
-        esac
+    local prompt_re
+
+    # Set OS dependent exact match regular expression
+    if [[ ${OSTYPE} == darwin* ]]; then
+      # macOS
+      prompt_re="[[:<:]]${1}[[:>:]]"
+    else
+      # Linux, FreeBSD, etc.
+      prompt_re="\<${1}\>"
+    fi
+
+    if [[ ${PROMPT_COMMAND} =~ ${prompt_re} ]]; then
+      return
+    elif [[ -z ${PROMPT_COMMAND} ]]; then
+      PROMPT_COMMAND="${1}"
+    else
+      PROMPT_COMMAND="${1};${PROMPT_COMMAND}"
     fi
 }