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Terraform
Général
Import existing resource 
terraform import aws_instance.myvm i-123456

Links an existing resource to Terraform state.
Initialize project 
terraform init

Prepares directory, downloads plugins and providers.
List providers 
terraform providers

Displays active providers for the project.
Update modules 
terraform get -update

Fetches and updates used modules.
Validate syntax 
terraform validate

Checks structure and configuration consistency.
Apply
Apply configuration 
terraform apply

Executes changes: create/modify/destroy.
Destroy infrastructure 
terraform destroy

Deletes entire managed infrastructure.
Refresh state only 
terraform apply -refresh-only

Updates state without changes.
Lock state 
terraform apply -lock=true

Prevents concurrent modifications of state.
Plan
Show plan outputs 
terraform show tfplan

Reads plan and displays outputs and changes.
Generate binary plan 
terraform plan -out mon_plan.tfplan

Creates executable plan file.
Full destroy plan 
terraform plan -destroy

Previews complete infrastructure destruction.
Show planned changes 
terraform plan

Displays detailed planned modifications.
State
List all state resources 
terraform state list

Lists all resources tracked in state.
Remove resource from state 
terraform state rm aws_instance.old

Detaches resource without destroying it.
Show resource in state 
terraform state show aws_instance.myvm

Displays detailed resource state information.