Introducing the cmd: Essential commands for your daily work 🔖

#webdev #cli #softwareengineering #cheatsheet

Background

As a software engineer, are you tired of constantly searching for that one CLI command you can't quite remember? Look no further! I'm excited to introduce my new CLI Commands Reference project (cmd), a comprehensive collection of essential command-line commands for your daily tasks.

Project Overview

This newly created project aims to be your go-to resource for quickly looking up commands across a wide range of technologies.
The cmd repository collects essential command-line commands for a software engineer's daily tasks 📑

Website: tungbq.github.io/cmd (auto-deploy on source code changed)
Source code: tungbq/cmd ⭐
Contributing guideline: here 📖

As this is a growing project and may not be the perfect version as of now. So if you have any tools or commands you'd like to see added, please feel free to comment or create a pull request. Your contributions are what will make this resource truly valuable for the entire community.

Now lets check the content that we had so far in the first release v0.1.0 🚀

Linux Commands
SSH Commands
JQ Commands
Git Commands
Docker Commands
Kubernetes Commands
Helm Commands
Ansible Commands
Terraform Commands
PostgreSQL Commands
Python Commands
Azure CLI Commands
...and more upcoming content, stay tuneeeeed!

Linux Commands

# Clear terminal output
clear

# List files in the current directory with details
ls -la

# Check system stats
df -h
cat /etc/os-release
cat /proc/meminfo
nproc

# Working with linux service
systemctl status target_service
systemctl start target_service
systemctl stop target_service
journalctl -u target_service

# Change file mode
chmod +x some_file.sh

# Change directory owner
chown 0600 /path/to/directory

# Create new directory
mkdir -p /path/to/directory

# Change directory
cd /path/to/directory

# Copy a file or directory
cp source destination

# Move or rename a file or directory
mv old-name new-name

# Remove a file
rm file-name

# Show disk usage of directories and files
du -h --max-depth=1

# Search for a pattern in files
grep -r "pattern" /path/to/search

# Display the current directory's path
pwd

# History
history

# CURL, add '-k' to ignore certificate verification
curl https://abc.example.com

# wget - Download a file from a URL
wget http://example.com/file.zip

# wget - Download a file and save it with a different name
wget -O newfile.zip http://example.com/file.zip

# Check network
netstat -anpt

# Check system metric (CPU/RAM/...)
top

# Tar
tar -cvf sampleArchive.tar /home/sampleArchive

# Extract
tar -xvf sampleArchive.tar
tar -xvf sampleArchive.tar.gz -C /home/ExtractedFiles/

SSH Commands

# Generate SSH keys
ssh-keygen -t rsa

# SSH to a server using username/password
ssh user@1.2.3.4

# SSH to a server using key
ssh -i user_key.pem user@1.2.3.4

# Use locally available keys to authorise logins on a remote machine
ssh-copy-id user@1.2.3.4

JQ Commands

# Pretty-print JSON data
jq '.'

# Extract a specific field from a JSON object
jq '.fieldName' file.json

# Filter JSON data by a specific condition
jq 'select(.fieldName == "value")' file.json

# Parse JSON from an API response
curl -s http://api.example.com/data | jq '.'

# Flatten a nested JSON structure
jq '.[].nestedField' file.json

# Format JSON output into a more readable structure
jq '.' file.json | less

Git Commands

# Clone repo via HTTPS
git clone https://github.com/REPO_OWNER/repo.git

# Clone repo via SSH
git clone git@github.com:REPO_OWNER/repo.git

# Create a new branch
git checkout -b new-branch

# Pull the latest changes from the remote repository
git pull origin main

# Check the status of your working directory
git status

# Add all changes to the staging area
git add .

# Commit changes with a message
git commit -m "Your commit message"

# View log
git log

# Push to remote feature branch
git push origin new-branch

# Reset staging area to match the lastest origin commit
git reset origin/main

Docker Commands

# List all running containers
docker ps

# List all containers (including stopped ones)
docker ps -a

# Build an image from a Dockerfile
docker build -t your-image-name .

# Run a container from an image
docker run --name container-name your-image-name

# Stop a running container
docker stop container-name

# Remove a stopped container
docker rm container-name

# Remove an image
docker rmi image-name

# Show container logs
docker logs container-name

# List all Docker images
docker images

# Enter a running container's shell
docker exec -it container-name /bin/bash

# Cleanup docker (add `-f` flag to force cleanup)
docker system prune

## Docker Compose
# Start up containers as defined in the Docker Compose file
docker compose up

# Start up containers in detached mode
docker compose up -d

# Stop running containers
docker compose down

Kubernetes Commands

# Export KUBECONFIG to access the cluster
export KUBECONFIG=/path/to/kubeconfig.conf

# Check nodes
kubectl get nodes

# Get all pods in the target namespace
kubectl get pods -n your_namespace

# Get all services in the current namespace
kubectl get svc -n your_namespace

# Get all resources in all namespace
kubectl get all -A

# Describe a pod
kubectl describe pod pod-name

# Apply a configuration to a resource by filename or stdin
kubectl apply -f config-file.yaml

# Delete resources by filenames, stdin, resources, and names
kubectl delete -f config-file.yaml

# Get logs from a pod
kubectl logs pod-name

# Execute a command in a container
kubectl exec -it pod-name -- /bin/bash

# Forward a port from a pod to the local machine
kubectl port-forward pod-name 8080:80

Helm Commands

# Add a Helm repository
helm repo add repo-name https://example.com/repo

# Update all Helm repositories
helm repo update

# Search for charts in a Helm repository
helm search repo repo-name

# Install a Helm chart
helm install release-name repo-name/chart-name

# List all Helm releases across all namespaces
helm list --all-namespaces

# Uninstall a Helm release
helm uninstall release-name

# Upgrade an existing Helm release
helm upgrade release-name repo-name/chart-name

# Get the status of a Helm release
helm status release-name

# Show the history of a Helm release
helm history release-name

Ansible Commands

# Run an Ansible playbook
ansible-playbook playbook.yml -i inventory.ini

# Run a single Ansible ad-hoc command
ansible all -m ping

# List all available Ansible roles
ansible-galaxy list

# Install a role from Ansible Galaxy
ansible-galaxy install role-name

# Test an Ansible inventory file
ansible-inventory --list -i inventory.ini

# Run an Ansible playbook with increased verbosity
ansible-playbook playbook.yml -vvv

Terraform Commands

# Initialize a Terraform configuration directory
terraform init

# Plan the changes required by the Terraform configuration
terraform plan

# Apply the changes required by the Terraform configuration
terraform apply

# Create a Terraform execution plan and save it to a file (recommended)
terraform plan -out="tfplan.out"

# Apply the changes from saved plan
terraform apply "tfplan.out"

# Apply the changes automatically (use with your own risk, suitable for automation tasks)
terraform apply --auto-aprove

# Destroy all the resources managed by Terraform
terraform destroy

# Validate the Terraform configuration files
terraform validate

# Format Terraform configuration files
terraform fmt

# Show the current state of Terraform-managed infrastructure
terraform show

# Refresh the state file with the real infrastructure
terraform refresh

# List the available Terraform providers
terraform providers

PostgreSQL Commands

# Connect to a PostgreSQL database
psql -h hostname -U username -d database_name

# List all databases
psql -c "\l"

# List all tables in the current database
psql -c "\dt"

# Show the structure of a specific table
psql -c "\d table_name"

# Create a new database
createdb new_database_name

# Drop an existing database
dropdb database_name

# Create a new user
createuser new_user_name

# Drop an existing user
dropuser user_name

# Grant all privileges on a database to a user
psql -c "GRANT ALL PRIVILEGES ON DATABASE database_name TO user_name"

# Revoke all privileges on a database from a user
psql -c "REVOKE ALL PRIVILEGES ON DATABASE database_name FROM user_name"

# Backup a PostgreSQL database to a file
pg_dump database_name > backup_file.sql

# Restore a PostgreSQL database from a backup file
psql database_name < backup_file.sql

Python Commands

# Run a python script
python python_script.py

# Install a package using pip
pip install package-name

# Install a specific version of a package
pip install package-name==1.2.3

# Uninstall a package
pip uninstall package-name

# List all installed packages
pip list

# Freeze installed packages into a requirements file
pip freeze > requirements.txt

# Install packages from a requirements file
pip install -r requirements.txt

Azure CLI Commands

# Login to Azure
az login

# Login with device code
az login --use-device-code

# Get the details of a subscription
az account show

# List all subscriptions associated with your account
az account list --output table

# Set a specific subscription as default
az account set --subscription "SUBSCRIPTION_ID"

# List all resource groups
az group list --output table

...and I am sure there are more upcoming content, stay tuneeeeed!

Conclusion

This CLI Commands Reference project is a living document, and I'm committed to keeping it updated and expanding it with your help. I hope this resource will become an useful resource for your daily work.

Final words, thank you for reading this post. If you have suggestions for new commands, improvements to existing ones, or even new categories to add, please don't hesitate to get involved. Let's work together to create the most comprehensive and up-to-date CLI reference for software engineers everywhere, your contributions can make a significant impact!

Don't forget to star the repository or bookmark the GitHub page tungbq.github.io/cmd if you found it useful, and happy coding ❤️!

Star tungbq/cmd ⭐️ on GitHub