terraform help

直接執行 terraform 預設就可以看到使用方法。

$ terraform
Usage: terraform [--version] [--help] <command> [args]

The available commands for execution are listed below.
The most common, useful commands are shown first, followed by
less common or more advanced commands. If you're just getting
started with Terraform, stick with the common commands. For the
other commands, please read the help and docs before usage.

Common commands:
    apply              Builds or changes infrastructure
    console            Interactive console for Terraform interpolations
    destroy            Destroy Terraform-managed infrastructure
    fmt                Rewrites config files to canonical format
    get                Download and install modules for the configuration
    graph              Create a visual graph of Terraform resources
    import             Import existing infrastructure into Terraform
    init               Initialize a new or existing Terraform configuration
    output             Read an output from a state file
    plan               Generate and show an execution plan
    providers          Prints a tree of the providers used in the configuration
    push               Upload this Terraform module to Terraform Enterprise to run
    refresh            Update local state file against real resources
    show               Inspect Terraform state or plan
    taint              Manually mark a resource for recreation
    untaint            Manually unmark a resource as tainted
    validate           Validates the Terraform files
    version            Prints the Terraform version
    workspace          Workspace management

All other commands:
    debug              Debug output management (experimental)
    force-unlock       Manually unlock the terraform state
    state              Advanced state management

terraform 對每一個 sub-command 都有 help 資訊

$ terraform graph -h
Usage: terraform graph [options] [DIR]

  Outputs the visual execution graph of Terraform resources according to
  configuration files in DIR (or the current directory if omitted).

  The graph is outputted in DOT format. The typical program that can
  read this format is GraphViz, but many web services are also available
  to read this format.

  The -type flag can be used to control the type of graph shown. Terraform
  creates different graphs for different operations. See the options below
  for the list of types supported. The default type is "plan" if a
  configuration is given, and "apply" if a plan file is passed as an
  argument.

Options:

  -draw-cycles   Highlight any cycles in the graph with colored edges.
                 This helps when diagnosing cycle errors.

  -no-color      If specified, output won't contain any color.

  -type=plan     Type of graph to output. Can be: plan, plan-destroy, apply,
                 validate, input, refresh.