Friday, September 19, 2025

Debian 13: using systemd-resolved to replace old way to resolving dns

Install systemd-resolved 

# apt-get install  systemd-resolved

Enable it

# systemctl enable systemd-resolved

Old fashion /etc/resolv.conf 

# Generated by NetworkManager
nameserver 45.90.28.186
nameserver 8.8.8.8
nameserver 1.1.1.1

Change/Edit configuration file /etc/systemd/resolved.conf 

DNS=45.90.28.186 8.8.8.8 1.1.1.1
DNSOverTLS=yes

Restart systemd-resolved

# systemctl restart systemd-resolved

Test it

# nslookup duckduckgo.com
Server:        127.0.0.53
Address:    127.0.0.53#53

Non-authoritative answer:
Name:    duckduckgo.com
Address: 20.43.161.105

Done.  

Tuesday, September 16, 2025

Debian 13: UEFI partition during installation process

Begin in 2011, computer manufacturers were moving to use UEFI and left BIOS. Today, it is mandatory for system with UEFI to have separate partition for EFI System Partition / ESP. 

ESP contain boot loader to start operating system. One ESP may contain some boot loader for different operating system. Size of ESP for windows and Debian is 500MB to avoid problem when update occurred. It means for multi OS with different boot loader, ESP partition required bigger size.

During Debian installation, at step configure partition, create:

  • size: 500 MB or bigger
  • type: "EFI System Partition (ESP)", "EFI System Partition" or similar

All partitions required in Debian 13 system are:

  1. ESP: 500MB or bigger, will marked boot sector 0xEE
  2. Swap: 2 times physical memory. IMO, for physical memory more then 16GB, swap size equal to physical memory or less.
  3. root partition for single point mount /, or custom partition.

There are 3 types boot process and its year period:

  1. BIOS: old PC
  2. BIOS + GPT PC 2000-2020 
  3. ESP + GPT PC > 2020 

Monday, September 15, 2025

Python: using gemini and chatgpt to help creating python3 code to get last 3 characters in composite name in Sheet1

We define the problem to ask AI to generate python code. This is the crucial part, to get output that we expected.

In Indonesia language we define:

saya punya data excel di sheet1 yang berisi nama.
headet sheet1 adalah no dan nama komposit.
nama komposit terdiri dari 2 nama dipisah dengan tanda /.
tidak semua nama komposit memiliki 2 nama.
nama pertama ada yang menggunakan nama panggilan yang disimpan didalam tanda ().
nama pertama selalu ada disetiap row.
sayang ingin mengambil 3 huruf terakhir dari nama pertama, bukan yang berada dalam tanda kurung.
buatkan kode pyhton3 dengan openpyxl library.
print no, nama, dan 3 huruf terakhir, gunakan ; untuk pemisah dan masukan string kedalam "" agar output mudah di simpan kedalam csv.

In English language we define:

I have Excel data in sheet 1 containing names.
The header of sheet 1 is a composite number and name.
A composite name consists of two names separated by a / symbol.
Not all composite names have two names.
Some first names use nicknames stored within the () symbol.
The first name is always present in every row.
Unfortunately, I want to extract the last three letters of the first name, not the ones in parentheses.
Create a Python 3 code using the OpenPyXL library.
Print the number, name, and last three letters, use ; as the separator, and enclose the string in "" to make the output easy to save to a CSV.

Choose one of them, feed it into chat.openai.com / chatgpt.com and gemini.google.com, you can use 2 tab or 2 window browser. This is only example, you need to define your expected output.

I replace xlsx file name "data_tr.xlsx"

Here is the code generated by chatgpt.com:

from openpyxl import load_workbook
import re

# Mengambil nama pertama dari "nama komposit" (sebelum tanda /)
# Menghapus bagian dalam tanda kurung () dari nama pertama
# Mengambil 3 huruf terakhir dari nama pertama yang telah dibersihkan

# Ganti dengan path ke file Excel kamu
file_path = "data_tr.xlsx"

# Load workbook dan sheet
wb = load_workbook(filename=file_path)
ws = wb["Sheet1"]

# Print header
print('"no";"nama komposit";"3 huruf terakhir"')

# Proses tiap baris (mulai dari baris ke-2 karena baris 1 adalah header)
for row in ws.iter_rows(min_row=2, max_col=2):
    no = row[0].value
    nama_komposit = str(row[1].value).strip() if row[1].value else ""

    # Ambil nama pertama dari nama komposit
    nama_pertama = nama_komposit.split("/")[0].strip()

    # Hapus isi dalam tanda kurung, misalnya (Budi)
    nama_pertama_bersih = re.sub(r"\([^)]*\)", "", nama_pertama).strip()

    # Ambil 3 huruf terakhir (jika cukup panjang)
    tiga_huruf_terakhir = nama_pertama_bersih[-3:] if len(nama_pertama_bersih) >= 3 else nama_pertama_bersih

    # Format dan cetak hasil
    print(f'"{no}";"{nama_komposit}";"{tiga_huruf_terakhir}"')

Here is the code generated by gemini:

import openpyxl

# Ganti 'nama_file_anda.xlsx' dengan nama file Excel Anda
file_path = 'data_tr.xlsx'

try:
    # Membuka workbook dan memilih sheet aktif
    workbook = openpyxl.load_workbook(file_path)
    sheet = workbook.active

    # Mencetak header
    header_string = '"No";"Nama Komposit";"3 Huruf Terakhir"'
    print(header_string)

    # Iterasi dari baris ke-2 (mengabaikan header yang sudah dicetak)
    for row in sheet.iter_rows(min_row=2):
        no_cell = row[0]
        nama_komposit_cell = row[1]
        
        # Mengabaikan baris kosong
        if not no_cell.value or not nama_komposit_cell.value:
            continue

        # Mengambil nilai dari cell
        no = no_cell.value
        nama_komposit = str(nama_komposit_cell.value)
        
        # Memisahkan nama komposit berdasarkan '/'
        nama_pertama = nama_komposit.split('/')[0].strip()
        
        # Menghapus nama panggilan dalam kurung
        if '(' in nama_pertama and ')' in nama_pertama:
            idx_buka = nama_pertama.find('(')
            nama_pertama = nama_pertama[:idx_buka].strip()
            
        # Mengambil 3 huruf terakhir dari nama pertama dan mengubahnya menjadi huruf kapital
        tiga_huruf_terakhir = nama_pertama[-3:].upper()
        
        # Mencetak data sesuai format yang diminta
        output_string = f'"{no}";"{nama_komposit}";"{tiga_huruf_terakhir}"'
        print(output_string)

except FileNotFoundError:
    print(f"Error: File '{file_path}' tidak ditemukan. Pastikan nama file sudah benar.")
except Exception as e:
    print(f"Terjadi kesalahan: {e}")

The code contain Indonesia Languge when the chat feed in Indonesia Language.

If you use virtual environment, activate it first

$ cd mypyenv
~/mypyenv$ source venv/bin/activate

Remember, AI may make mistake the output was generated base on statistics  values from every tokens. You must check the output. You may seen the output style has deference based on data the AI developer feed during learning.

This is the way AI help to create source code that we never learn before.

Tuesday, September 9, 2025

Python: fixing indentation in python

In python, indentation must consistent, runtime will report error if indentation inconsistent. 

It is hard if we use some editor to write the code. We can use black to fix it automatically base on pep 8 (Python Enhancement Proposal  8).

Installing black

# apt-get install black
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  python3-click python3-mypy-extensions python3-pathspec python3-platformdirs
Suggested packages:
  python-black-doc
The following NEW packages will be installed:
  black python3-click python3-mypy-extensions python3-pathspec
  python3-platformdirs
0 upgraded, 5 newly installed, 0 to remove and 1 not upgraded.
Need to get 1,502 kB of archives.
After this operation, 6,442 kB of additional disk space will be used.

Using black

$ black ./[your_python_file_to_fix].py
reformatted [your_python_file_to_fix].py

All done! ✨ 🍰 ✨
1 file reformatted.

Wednesday, September 3, 2025

Debian 13: troubleshooting connecting to wifi using cmd nmcli

I prefer to use command line because mostly server does not  installed window manager. I need to familiar to use command line in any situation.

To show wifi radio enable

# nmcli radio wifi
enabled

To turn on radio wifi

# nmcli radio wifi on

To list available wifi

# nmcli device wifi list
IN-USE  BSSID              SSID   
...

To rescan available wifi

# nmcli dev wifi rescan

To connect to wifi access point

# nmcli device wifi connect "[your_SSID]" password "[your_password]"
...

To show connection

# nmcli connection show
NAME                UUID                                  TYPE      DEVICE
...

Note: parameter dev is short from device