Install Terraform

Goto link https://www.terraform.io/downloads.html and download the terraform to your local machine and cd to the directory annd follow step 2


step 1: download Terraform using this command: curl
MAC URL:
curl -o "/tmp/terraform.zip" https://releases.hashicorp.com/terraform/0.13.5/terraform_0.13.5_darwin_amd64.zip

Linux URL:
curl -o "/tmp/terraform.zip" https://releases.hashicorp.com/terraform/0.13.5/terraform_0.13.5_linux_amd64.zip


step 2: Install a program called ‘unzip’ in order to unpack 
Redhat Linux:
sudo yum install unzip
Mac:
brew install unzip 

step 3: once installed, unpack the Terraform download: unzip
unzip /tmp/terraform.zip && rm -rf /tmp/terraform.zip

step 4: Move the terrform binary to bin directory
MAC:
mv terraform /usr/local/bin/

step 5: Test that Terraform is installed by typing this command: 
terraform version