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オーラ

Table of Contents

1. C++

1.1 Running on Linux

To compile and run via CLI:

g++ program.cpp -o program   # compiles program.cpp → program
./program                    # runs the executable

Alternative:

g++ % -o program && ./program   # % = current file
:!g++ % -o program && ./program # run directly in vim (! runs in shell)
``

## Ollama

```bash
curl -fsSL https://ollama.com/install.sh | sh
ollama run deepseek-r1:1.5b

2. Endeavor OS

2.1 Fix brightness problem on RTX laptops

sudo nano /etc/default/grub

Find and update this line (usually at 5–6th line):

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video acpi_osi=! acpi_osi='Windows 2015'"

Then update GRUB:

sudo grub-mkconfig -o /boot/grub/grub.cfg

2.2 Enable Bluetooth

sudo systemctl enable bluetooth.service
sudo systemctl start bluetooth.service

2.3 Fix DNS resolution issue

sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf
sudo systemctl restart systemd-resolved
sudo bash -c 'echo -e "[Resolve]\nDNS=1.1.1.1 8.8.8.8\nFallbackDNS=1.0.0.1 8.8.4.4" > /etc/systemd/resolved.conf.d/dns.conf'
sudo systemctl restart systemd-resolved

2.4 Get Fish shell

sudo pacman -S fish
chsh -s /usr/bin/fish
fish_config    # to change themes
nano ~/.config/fish/config.fish
# set fish_greeting "" <-- Add this line to disable welcome message

2.5 Disable KDE-Wallet

Navigate to ~/.config/kwalletrc & replace it's contents with,

[Wallet]
“Enabled=false”

2.6 Useful Commands

Command Description
ps Show running processes.
ps aux Detailed list of all processes.
ps -ef Another common full-format listing.
top Real-time process viewer.
htop Enhanced interactive process viewer (sudo pacman -S htop).
atop Advanced system and process monitor (sudo pacman -S atop).
pgrep <name> Find PID(s) of processes by name.
pidof <program> Get PID of a program.
pstree Show processes in a tree structure.
kill <PID> Terminate a process.
btop Cool task manager.
fzf Search from CLI.
neofetch Display system specifications in a nice way.
ls / lsd Display available content (ls ./ to search).
ffmpeg Edit/convert video files.
tldr Better version of --help. Example: tldr ffmpeg.

2.7 Shortcuts

  • Shift + PrtSc → Screenshot
  • Alt + Tab → Switch windows
  • Ctrl + Tab → Switch browser tabs

3. Git

3.1 .gitignore

leetcode/*         # ignore everything inside leetcode/
!leetcode/*.cpp    # but don't ignore .cpp files
!leetcode/*.h      # but don't ignore .h files

Think of it as a priority system:

  1. First rule ignores everything in leetcode/
  2. Later ! rules bring back .cpp and .h

Syntax notes:

  • # → comments
  • * → wildcard (like shell globbing)
  • ! → negation (keep files even if ignored earlier)
  • / → path separator

Closest to Unix shell globbing, but Git-specific.

3.2 Restore

git restore <nameOfFile>

this functions restores the specified file to it's last commit

4. Hyprland

mv old.py new.py   # rename file
rm new.cpp         # delete file
nmtui              # GUI Wi-Fi setup

Shortcuts:

  • Super + Q → New Terminal
  • Super + C → Close Terminal
  • Super + M → Exit Hyprland
  • Super + R → Search

5. Python

5.1 Create a Virtual environment

python3 -m venv <nameOfVenv>

# Activate the virtual environment
source <nameOfVenv>/bin/activate # (bash/zsh)
source venv/bin/activate.fish # (fish)

<nameOfVenv>\Scripts\activate.bat # (cmd)
<nameOfVenv>\Scripts\Activate.ps1 # (powershell)

# Deactivate the virtual environment
deactivate

5.2 Requirements file

# Output the list of installed packages
pip freeze

# Write the list of installed packages to a file
pip freeze > requirements.text

# Install the packages listed in the requirements.txt file
pip install -r requirements.txt

6. Vim

:%y+        " Select all + copy to clipboard
vim ~/.vimrc    " Open vim config
source ~/.vimrc " Reload config instantly

7. VSCode

7.1 Short-cuts

  • ctrl+Space-bar -> intelliSense suggestions
  • alt+mouseClick -> multi-cursor functionality

7.2 To Remove VSCode Icon from Title-bar

# Open following file
code "C:\Users\<User_Name>\AppData\Local\Programs\Microsoft VS Code\<commit_hash>\resources\app\out\vs\workbench\workbench.desktop.main.css"
# search: '.window-appicon'
#  choose the first one you had searched, change the value: 'width:35px;' to 'width:0px;'

8. Windows

8.1 Terminal

  • Character Map

  • Terminal setups:

    notepad $PROFILE
Get-ChildItem $env:POSH_THEMES_PATH

8.2 Git Bash

git tag -a tagName -m "message here"
git push --tags

8.3 OhMyPosh

Used ohmyposh to get custom powerlines created my own theme, can be used by running

oh-my-posh init pwsh --config "$env:POSH_THEMES_PATH\mytheme.omp.json" | Invoke-Expression

Can be set as default by pasting above line in notepad $PROFILE

9. Tips

9.1 How markdown heading anchors work

  • Lowercase everything
  • Spaces → -
  • Remove special characters (so C++ → #c, Endeavor OS → #endeavor-os)

This works natively on GitHub, Obsidian, VS Code preview, and most markdown renderers.