Keep user's shell prompt string if it exists

require-ess/tools/setE3Env.bash

@@ -354,5 +354,18 @@ echo "##############################################"
 echo
 
 BASE_version=$(echo "${EPICS_BASE##*/}" | awk -F '-' '{print $2}')
+E3_ENV_INFO="{B:$BASE_version R:$E3_REQUIRE_VERSION}"
+NEW_E3_PS="${E3_ENV_INFO}\[\033[33m\]\u\[\033[m\]@\[\033[33;1m\]\w\[\033[m\]\$ "
 
-export PS1="\[\033[33m\]\u\[\033[m\] @ Base:$BASE_version Req:$E3_REQUIRE_VERSION \[\033[33;1m\] \w\[\033[m\]\$ "
+if [ -z "$E3_ENV_ON" ]; then   
+  if [ -z "$PS1" ]; then
+    export E3_ENV_ON="ON"
+    export PS1="${NEW_E3_PS}"
+  else
+    export E3_ENV_ON="ON" 
+    export PS1="${E3_ENV_INFO}${PS1}"
+  fi                                  
+else
+  PS_TMP=${PS1/\{*\}/}
+  export PS1="${E3_ENV_INFO}${PS_TMP}"
+fi