Seemingly every time I check, there is a new version of Terraform out there. If you have been at the Infrastructure-as-Code game for a bit using Terraform, most likely you understand the need to test and use different versions of Terraform.

Luckily there is a utility, tfenv (https://github.com/tfutils/tfenv), that makes switching a breeze.

Quick Install (Mac OS X)

$ brew install tfenv

Quick Install (Linux)

$ git clone https://github.com/tfutils/tfenv.git ~/.tfenv
$ echo 'export PATH="$HOME/.tfenv/bin:$PATH"' >> ~/.bash_profile

Now install your desired version of Terraform! Here's what that looks like on my WSL / Debian environment.

$ tfenv install
Installing Terraform v0.12.24
Downloading release tarball from https://releases.hashicorp.com/terraform/0.12.24/terraform_0.12.24_linux_amd64.zip
############################################################################################################################################################# 100.0%Downloading SHA hash file from https://releases.hashicorp.com/terraform/0.12.24/terraform_0.12.24_SHA256SUMS
No keybase install found, skipping OpenPGP signature verification
Archive:  tfenv_download.hzyDKi/terraform_0.12.24_linux_amd64.zip
  inflating: /home/brian/.tfenv/versions/0.12.24/terraform  
Installation of terraform v0.12.24 successful. To make this your default version, run 'tfenv use 0.12.24'
$ tfenv use 0.12.24
Switching default version to v0.12.24
Switching completed
$ 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
    env                Workspace management
    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 Terraform working directory
    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 Atlas 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:
    0.12checklist      Checks whether the configuration is ready for Terraform v0.12
    debug              Debug output management (experimental)
    force-unlock       Manually unlock the terraform state
    state              Advanced state management

BAM! Easy!

Now that you've improved your workflow, get out there and break some stuff.