The terraform fmt command formats Terraform configuration file contents so that it matches the canonical format and style. This command applies a subset of the Terraform language style conventions, along with other minor adjustments for readability.
Terraform commands that generate Terraform configuration produce configuration files that conform to the style imposed by terraform fmt. Follow this style in your files to ensure consistency.
The canonical format may change in minor ways between Terraform versions, so after upgrading Terraform we recommend to proactively run terraform fmt on your modules along with any other changes you are making to adopt the new version.
We do not consider new formatting rules in terraform fmt to be a breaking change in new versions of Terraform, but we minimize changes for configurations that already follow the style examples shown in the Terraform documentation. New formatting rules programmed into the terraform fmt command are usually expansions to include existing rules from the documentation. We recommend following the documented style even for decisions that terraform fmt does not yet apply automatically.
Formatting decisions are always subjective and so you might disagree with the decisions that terraform fmt makes. This command is intentionally opinionated and has no customization options because its primary goal is to encourage consistency of style between different Terraform codebases, even though the chosen style can never be everyone's favorite.
We recommend that you follow the style conventions applied by terraform fmt when writing Terraform modules, but if you find the results particularly objectionable then you may choose not to use this command, and possibly choose to use a third-party formatting tool instead. If you choose to use a third-party tool then you should also run it on files that are generated automatically by Terraform, to get consistency between your hand-written files and the generated files.
Usage: terraform fmt [options] [target...]
By default, the terraform fmt command scans your current directory for configuration files. You can also provide a target argument to tell terraform fmt to scan:
-).The terraform fmt command accepts the following arguments.
-list=false Prevents the command from listing the files containing formatting inconsistencies. Optional -diff Displays the diffs of formatting changes. Optional -write=false Prevents the command from overwriting files. This behavior is implied by the -check flag or if the input is from STDIN. Optional -check Checks if the input is formatted. The exit status is 0 if the command's input is properly formatted. Otherwise, the exit status is non-zero, and the command outputs a list of improperly formatted file names. Optional -recursive Processes files in subdirectories in addition to the current directory. By default, the command only processes the specified, or current, directory. Optional
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