terraform validate --help

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Check for updates to the options: https://www.terraform.io/docs/commands/index.html

Usage: terraform validate [options] [dir]

  Validate the terraform files in a directory. Validation includes a
  basic check of syntax as well as checking that all variables declared
  in the configuration are specified in one of the possible ways:

      -var foo=...
      -var-file=foo.vars
      TF_VAR_foo environment variable
      terraform.tfvars
      default value

  If dir is not specified, then the current directory will be used.

Options:

  -check-variables=true If set to true (default), the command will check
                        whether all required variables have been specified.

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

  -var 'foo=bar'        Set a variable in the Terraform configuration. This
                        flag can be set multiple times.

  -var-file=foo         Set variables in the Terraform configuration from
                        a file. If "terraform.tfvars" is present, it will be
                        automatically loaded if this flag is not specified.