diff --git a/README.md b/README.md
index a157797..77103c3 100644
--- a/README.md
+++ b/README.md
@@ -146,7 +146,13 @@ git clone https://github.com/danielmiessler/fabric.git
 cd fabric
 ```
 
-4. Install poetry
+4. Ensure the `setup.sh` script is executable. If you're not sure, you can make it executable by running the following command:
+
+```bash
+chmod +x setup.sh
+```
+
+5. Install poetry
 
 ref.: https://python-poetry.org/docs/#installing-with-the-official-installer
 
@@ -154,7 +160,7 @@ ref.: https://python-poetry.org/docs/#installing-with-the-official-installer
 curl -sSL https://install.python-poetry.org | python3 -
 ```
 
-5. Run the `setup.sh`, which will do the following:
+6. Run the `setup.sh`, which will do the following:
   - Installs python dependencies.
   - Creates aliases in your OS. It should update `~/.bashrc`, `/.zshrc`, and `~/.bash_profile` if they are present in your file system.
 
@@ -162,9 +168,9 @@ curl -sSL https://install.python-poetry.org | python3 -
 ./setup.sh
 ```
 
-6. Restart your shell to reload everything.
+7. Restart your shell to reload everything.
 
-7. Set your `OPENAI_API_KEY`.
+8. Set your `OPENAI_API_KEY`.
 
 ```bash
 fabric --setup
@@ -172,7 +178,7 @@ fabric --setup
 
 You'll be asked to enter your OpenAI API key, which will be written to `~/.config/fabric/.env`. Patterns will then be downloaded from Github, which will take a few moments.
 
-8. Now you are up and running! You can test by pulling the help.
+9. Now you are up and running! You can test by pulling the help.
 
 ```bash
 # Making sure the paths are set up correctly
diff --git a/setup.sh b/setup.sh
index acfb5c3..999caca 100755
--- a/setup.sh
+++ b/setup.sh
@@ -1,5 +1,12 @@
 #!/bin/bash
 
+# Check if pyproject.toml exists in the current directory
+if [ ! -f "pyproject.toml" ]; then
+  echo "Poetry could not find a pyproject.toml file in the current directory or its parents."
+  echo "Please navigate to the project directory where pyproject.toml is located and rerun this script."
+  exit 1
+fi
+
 # Installs poetry-based python dependencies
 echo "Installing python dependencies"
 poetry install
@@ -8,10 +15,10 @@ poetry install
 commands=("fabric" "fabric-api" "fabric-webui")
 
 # List of shell configuration files to update
-config_files=(~/.bashrc ~/.zshrc ~/.bash_profile)
+config_files=("$HOME/.bashrc" "$HOME/.zshrc" "$HOME/.bash_profile")
 
-# Initialize an empty string to hold the path of the sourced file
-source_command=""
+# Initialize an array to hold the paths of the sourced files
+source_commands=()
 
 for config_file in "${config_files[@]}"; do
   # Check if the configuration file exists
@@ -19,30 +26,45 @@ for config_file in "${config_files[@]}"; do
     echo "Updating $config_file"
     for cmd in "${commands[@]}"; do
       # Get the path of the command
-      CMD_PATH=$(poetry run which $cmd)
+      CMD_PATH=$(poetry run which $cmd 2>/dev/null)
+
+      # Check if CMD_PATH is empty
+      if [ -z "$CMD_PATH" ]; then
+        echo "Command $cmd not found in the current Poetry environment."
+        continue
+      fi
 
       # Check if the config file contains an alias for the command
-      if grep -q "alias $cmd=" "$config_file"; then
-        # Replace the existing alias with the new one
-        sed -i "/alias $cmd=/c\alias $cmd='$CMD_PATH'" "$config_file"
+      if grep -qE "alias $cmd=|alias $cmd =" "$config_file"; then
+        # Compatibility with GNU and BSD sed: Check for operating system and apply appropriate sed syntax
+        if [[ "$OSTYPE" == "darwin"* ]]; then
+          # BSD sed (macOS)
+          sed -i '' "/alias $cmd=/c\\
+alias $cmd='$CMD_PATH'" "$config_file"
+        else
+          # GNU sed (Linux and others)
+          sed -i "/alias $cmd=/c\alias $cmd='$CMD_PATH'" "$config_file"
+        fi
         echo "Updated alias for $cmd in $config_file."
       else
         # If not, add the alias to the config file
-        echo -e "\nalias $cmd='$CMD_PATH'" >> "$config_file"
+        echo -e "\nalias $cmd='$CMD_PATH'" >>"$config_file"
         echo "Added alias for $cmd to $config_file."
       fi
     done
-    # Set source_command to source the updated file
-    source_command="source $config_file"
+    # Add to source_commands array
+    source_commands+=("$config_file")
   else
     echo "$config_file does not exist."
   fi
 done
 
-# Provide instruction to source the updated file
-if [ ! -z "$source_command" ]; then
-  echo "To apply the changes, please run the following command in your terminal:"
-  echo "$source_command"
+# Provide instruction to source the updated files
+if [ ${#source_commands[@]} -ne 0 ]; then
+  echo "To apply the changes, please run the following command(s) in your terminal:"
+  for file in "${source_commands[@]}"; do
+    echo "source $file"
+  done
 else
   echo "No configuration files were updated. No need to source."
 fi