Package Management with dpkg

Install a local .deb package:

sudo dpkg -i package.deb

Remove a package while keeping configuration files:

sudo dpkg -r package_name

Purge both the package and its configuration files:

sudo dpkg --purge package_name

List all installed packages:

dpkg -l

Display information about a .deb file:

dpkg -I package.deb

Display Configuration via xrandr

Query connected displays and supported modes:

xrandr --query

Set resolution and refresh rate for a specific output (e.g., HDMI-1-0):

xrandr --output HDMI-1-0 --mode 1920x1080 --rate 144

Secure Shell (SSH) Usage

Connect to a remote host on a custom port:

ssh -p 6000 v3-1000@100.100.100.100

Generate an SSH key pair:

ssh-keygen

Copy the public key to a remote server:

ssh-copy-id -p 6000 v3-1000@100.100.100.100

File Transfer Tools

Upload a file using scp:

scp /home/curme/Documents/cyb.txt smith@100.100.100.100:/home/smith/Documents/

Recursively upload a directory:

scp -r /home/curme/Documents/cyb/ smith@100.100.100.100:/home/smith/Documents/

Download a file from a remote server:

scp smith@100.100.100.100:/home/smith/Documents/smith.txt /home/curme/Documents/

Use rsync over SSH for efficient transfers:

rsync -avz -e "ssh -p 22" /mnt/d/curme/KEEP_CYB/*.tar.gz smith@111.111.111.111:/home/curme/

Git Basics

Initialize a new repository:

git init

Stage changes:

git add path/to/file

Commit staged changes:

git commit -m "Descriptive message"

Archive Handling with tar

Create a gzip-compressed archive:

tar -czvf archive.tar.gz source_file

Create an xz-compressed archive:

tar -cJvf archive.tar.xz source_file

Extract a .tar.gz file:

tar -xzvf archive.tar.gz

Extract a .tar.xz file:

tar -xJvf archive.tar.xz

Directory Listing Enhancements

Show all files, including hidden ones:

ls -la

Display human-readable file sizes:

ls -lh

Countt regular files in the current directory:

ls -l | grep '^-' | wc -l

Count directories:

ls -l | grep '^d' | wc -l

Python Package Management with pip

List outdated packages:

pip list --outdated

Upgrade a specific package to a version:

pip install --upgrade package_name==1.2.3

Fun Terminal Utilities

Display a speaking cow:

cowsay "Hello, world!"

Simulate a Matrix-style terminal rain:

cmatrix -C blue

Print large ASCII banners:

banner Linux

Install and set up Oh My Zsh:

sudo apt install zsh
sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

ZIP Compression

Compress a directory:

zip -r archive.zip source_directory/

Encrypt during compression:

zip -re secure.zip sensitive_data/

Extract to a specific directory:

unzip archive.zip -d destination_folder/

Disk Image and Filesystem Operations

Create a 256 MB blank disk image:

dd if=/dev/zero of=virtual.img bs=1M count=256

Format a device with ext4:

mkfs.ext4 /dev/sdb

Mount a partition as read-only:

mount -o ro /dev/sda3 /media/usb

Unmount a filesystem:

umount /media/usb

Disk Usage Analysis

Show human-readable disk usage per subdirectory:

du -ah

Conda Environment Management

Create a new environment with Python 3.11:

conda create -n myenv python=3.11

Activate the environment (Linux/macOS):

source activate myenv

Deactivate the current environment:

source deactivate

Export environment to a YAML file:

conda env export > environment.yml

Recreate an environment from a file:

conda env create -f environment.yml

Remove an entire environment:

conda remove -n myenv --all

APT Package Management

Install a package:

sudo apt install package_name

Remove a package but keep configs:

sudo apt remove package_name

Fully purge a package and its dependencies:

sudo apt purge package_name
sudo apt autoremove

List all available packages:

apt list

GPU Memory Cleanup

Force-kill processes using NVIDIA GPUs to free memory:

fuser -v /dev/nvidia* 2>/dev/null | awk 'NR>1 {print "kill -9", $2}' | sh