diff --git a/helper_script.sh b/helper_script.sh
index 86002940989842b89ee1bceb7280d5cc36601bd1..97e052622ede3b221ddd5ec86e63526ce6701b3c 100644
--- a/helper_script.sh
+++ b/helper_script.sh
@@ -10,20 +10,20 @@ function cd() {
 
 
   # Check all sections of provided path.
-  for index in $(echo $cd_string | tr "/" "\n")
+  for index in $(echo ${cd_string} | tr "/" "\n")
   do
 
     # Check if we've looked at any paths yet.
-    if [[ "$cd_path" ]]
+    if [[ "${cd_path}" ]]
     then
       # Not first part of path. Simply concat index and prev path info.
-      cd_path="$cd_path/$index"
+      cd_path="${cd_path}/${index}"
     else
       # First part of path. Check current folder, before anything else.
-      cd_path="$index"
+      cd_path="${index}"
 
       # Deactivate if backing out and .venv folder exists in current folder.
-      if [[ "$index" == ".." ]]
+      if [[ "${index}" == ".." ]]
       then
         if [[ -d .venv ]]
         then
@@ -34,25 +34,25 @@ function cd() {
 
 
     # Check if current path equals home folder. If so, assume fresh start and deactivate.
-    if [[ "/$cd_path" == "$HOME" ]]
+    if [[ "/${cd_path}" == "${HOME}" ]]
     then
       cd_venv_deactivate
     fi
 
 
     # If backing up, check for .venv in parent folder.
-    if [[ "$index" == ".." ]]
+    if [[ "${index}" == ".." ]]
     then
       # Check for venv folder.
-      if [[ -d "$cd_path/.venv" ]]
+      if [[ -d "${cd_path}/.venv" ]]
       then
         cd_venv_deactivate
       fi
     else
-      # Otherwise, check if we're going into a new .venv.
-      if [[ -d "$cd_path/.venv" ]]
+      # Otherwise, check if we're going into an environment folder.
+      if [[ -d "${cd_path}/.venv" ]]
       then
-        cd_venv_activate "./$cd_path/.venv"
+        cd_venv_activate "./${cd_path}/.venv"
       fi
     fi
 
@@ -60,7 +60,7 @@ function cd() {
 
 
   # Execute normal cd command.
-  builtin cd "$cd_string"
+  builtin cd "${cd_string}"
 
 
   # Check for .venv folder in new directory.
@@ -81,10 +81,10 @@ cd_venv_activate() {
   cd_venv_deactivate
 
   # Ensure that folder is a Python environment.
-  if [[ -f "$1/bin/activate" ]]
+  if [[ -f "${1}/bin/activate" ]]
   then
     # Load environment.
-    . "$1/bin/activate"
+    . "${1}/bin/activate"
   fi
 }
 
@@ -94,7 +94,7 @@ cd_venv_activate() {
  ##
 cd_venv_deactivate() {
   # Check if environment is currently active.
-  if [[ -n "$VIRTUAL_ENV" ]]
+  if [[ -n "${VIRTUAL_ENV}" ]]
   then
     deactivate
   fi