Use file exists to check wether install is needed

run screenfetch in helloworld module

lnxtools.sh

@@ -1,17 +1,16 @@
 #!/bin/bash
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+cd "$DIR" || exit
+FILE=./your_system_information.txt
 
-if [ "$1" == "prepare" ]
-then
+if [ ! -f "$FILE" ]; then
     echo "Preparing your system for the first run"
     apt-get update -y && apt-get upgrade -y
-    apt-get install python3.7 python3-pip -y
+    apt-get install curl screenfetch python3.7 python3-pip -y
     pip3 install setuptools wheel regex
-    cd "$DIR" || exit
     pip3 install -r requirements.txt
     python3 main.py helloworld
 else
-    cd "$DIR" || exit
     python3 main.py "$@"
 fi

modules/helloworld/HelloWorld.py

@@ -6,8 +6,8 @@ class HelloWorld:
 
     def run(self):
         print("This shows that your installation is working correctly.")
+        subprocess.call("screenfetch", shell=True)
         print("You can now start using the tool.")
         output = subprocess.check_output("cat /etc/*-release", shell=True).decode("UTF-8")
-        print("Your system information \n" + output)
         with open("your_system_information.txt", "w") as file:
             file.write(output)