Added folder 'Linux_Wallpaper_Changer' in Miscellaneous. Allows the user to change the desktop wallpaper on Linux using the included python script (linux_wallpaper_changer.py)

Author: ritesh-dt

Scripts/Miscellaneous/Linux_Wallpaper_Changer/README.md

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+# Linux Wallpaper Changer
+<!--Remove the below lines and add yours -->
+Python script which change the desktop wallpaper of Linux-based operating system.
+
+### Prerequisites
+<!--Remove the below lines and add yours -->
+The script does not need any external modules. It uses in-built python libraries like pathlib, sys, Tkinter, etc. 
+
+### How to run the script
+<!--Remove the below lines and add yours -->
+Make sure you have Python 3.x installed on your machine then,
+1. Go to **Scripts/Miscellaneous/Linux_Wallpaper_Changer** in *Command Prompt* or *Terminal*
+2. Run the following command.
+    `python3 linux_wallpaper_changer.py`
+    or `python linux_wallpaper_changer.py`
+    
+
+### Screenshot/GIF showing the sample use of the script
+<!--Remove the below lines and add yours -->
+##### Before
+![Screenshot-Before](https://i.postimg.cc/cCxVQ5gz/wallpaper-before.png)
+##### After
+![Screenshot-After](https://i.postimg.cc/HnbVynMz/wallpaper-after.png)
+
+## *Author Name*
+<!--Remove the below lines and add yours -->
+[Ritesh T](https://github.com/ritesh-dt)

Scripts/Miscellaneous/Linux_Wallpaper_Changer/linux_wallpaper_changer.py

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+from tkinter import Tk, Label, Button     # from Tkinter import Tk for Python 2.x
+from tkinter.filedialog import askopenfilename
+import subprocess
+from sys import platform
+from pathlib import Path
+
+# Permitted Extensions
+ALLOWED_EXTENSIONS = ['jpg', 'jpeg', 'png']
+
+# Terminal command to change the background image (this may be different for different Linux distributions)
+LINUX_TERMINAL_COMMAND = ["gsettings", "set", "org.gnome.desktop.background", "picture-uri"]
+filename = None
+
+def get_file():
+    global filename
+    filename = askopenfilename(title="Choose an image", filetypes=[("Image files", ("*.jpg", "*.jpeg", "*.png"))])
+
+    # Check for extension and if it is not allowed set the file to None
+    if not filename.split(".")[-1] in ALLOWED_EXTENSIONS:
+        print("Please select a JPEG/PNG file")
+        filename = None
+    
+    print("Selected Image: ", filename)
+
+def set_wallpaper():
+    # Return if an image file is not selected
+    if filename == None:
+        return
+    # Identify the user's platform (Windows, Linux or Mac OS)
+    user_os = platform.lower()
+
+    if user_os in ["linux", "linux2"]:
+        # Convert the image path into a file uri
+        file_uri = Path(filename).as_uri()
+        
+        # Execute the terminal command to change the wallpaper using the image's file uri
+        process = subprocess.Popen(LINUX_TERMINAL_COMMAND + [file_uri], stdout=subprocess.PIPE)
+        stdout = process.communicate()
+        process.terminate()
+        
+        # Check for any errors and print them
+        if stdout[1]:
+            print(stdout)
+        else:
+            print("Wallpaper Set Successfully!")
+    else:
+        print("Your operating system is currently not supported")
+
+
+# Tkinter GUI
+window = Tk()
+window.title("Python World")
+title = Label(text="Linux Wallpaper Changer", height=2, width=40).pack()
+
+# Buttons to get file path and set the wallpaper
+file_chooser = Button(text="Choose an image (JPEG or PNG)", height=1, width=30, command=get_file).pack(pady=5)
+submit_button = Button(text="Set as wallpaper", height=2, width=30, command=set_wallpaper).pack(pady=5)
+window.mainloop()