Automate Terraform CLI

TL:DR
If you want to know more about the mechanisms at hand, head DOWNLOAD > TerraformCLI and CHECKSUM > Terraformchksm
First, create the PGP key and name it hashicorp.asc and save it in the same directory as the Terraform CLI will be installed at. (Click CHECKSUM https://www.hashicorp.com/security to copy the PGP key)
Second, I stored the Terraform CLI in the dir that I'm working in, save it at /usr/bin if you're using macOS or Linux. 
To start the script, I have created three arguments that will simplify the version and the file version that Hashicorp keeps updating. (for good reasons, I assume the developers want more features in Terraform I'm all for that)

#!/bin/bash
# Update Terraform version bash script automation
#Arguments
version=$1 #version# 0.2.28
tfver=$2 # terraform_0_2_28_darwin_amd64.zip
tfsha=$3 # terraform_0.2.28_SHA256SUMS
tfshasig=$4 #terraform_0.2.28_SHA256SUMS.sig
cd $HOME/Path/to/TerraformCLI
wget https://releases.hashicorp.com/terraform/$version/$tfver
gpg  --import hashicorp.asc
curl -Os https://releases.hashicorp.com/terraform/$version/$tfsha
curl -Os https://releases.hashicorp.com/terraform/$version/$tfshasig
gpg  --verify $tfshasig $tfsha
shasum -a 256 -c $tfsha
unzip $tfver
rm $tfver

The above image is showing four variables version number, file with version, SHA256SUMS with version, and SHA256SUMS.sig with version. 
Copy and paste the bash script and chmod +x automateTFCLI.sh, then execute the script with this command
./automateTFCLI.sh 0.12.28 terraform_0.12.28_darwin_amd64.zip terraform_0.12.28_SHA256SUMS terraform_0.12.28_SHA256SUMS.sig
The script takes care of downloading, checking the integrity of the file and then, unzipping and deleting. 
Leaving the Terraform CLI inflation (meaning in use)
Next run Terraform - version to output version and confirm you have the working Terraform. 
(side note, I was tired of typing long cli commands so I put an alias in bash_profile to shorten it i.e alias tf="terraform" and also 
tfplan="terraform init && terraform plan")

Hashicorp Terraform has made this much simpler by adding Terraform CLI from the repo using APT. SetupTFCLIAPT

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