Commands Reference

Terraform

Command	What it does
terraform init	Initialise working directory, download providers
terraform fmt	Format all .tf files to canonical style
terraform validate	Check syntax and configuration validity
terraform plan	Preview changes before applying
terraform apply	Provision or update resources
terraform apply -auto-approve	Apply without confirmation prompt (use carefully)
terraform destroy	Remove all managed resources
terraform output	Show all output values
terraform state list	List all resources in state
terraform state show <resource>	Show details of a specific resource in state
terraform import <resource> <id>	Import an existing resource into state

Command	What it does
aws sts get-caller-identity	Confirm which IAM user/role you are authenticated as
aws ec2 describe-vpcs	List all VPCs in current region
aws ec2 describe-instances	List all EC2 instances
aws cloudformation describe-stacks	List all CloudFormation stacks and their status
aws cloudformation delete-stack --stack-name X	Delete a CloudFormation stack
aws s3 ls	List all S3 buckets
aws rds describe-db-instances	List all RDS instances

Command	What it does
docker build -t name:tag .	Build an image from a Dockerfile
docker run -p 8080:3000 name:tag	Run a container mapping host port 8080 to container port 3000
docker ps	List running containers
docker ps -a	List all containers including stopped
docker exec -it <id> sh	Open a shell inside a running container
docker system prune -f	Remove all stopped containers and dangling images