bash script to install/update the AWS SAM CLI on Ubuntu

install-update-aws-sam.sh

#!/bin/bash -e

# https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-linux.html#cliv2-linux-install
# https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-completion.html

echo "make sure OS is up-to-date"
sudo apt update && sudo apt upgrade -y
sudo apt install unzip -y

echo "* Switching to new temporary tmp folder..."
pushd "$(mktemp -d)"
echo
echo "* Downloading the AWS SAM CLI installer for linux"
wget https://github.com/aws/aws-sam-cli/releases/latest/download/aws-sam-cli-linux-x86_64.zip -O aws-sam-cli-linux-x86_64.zip
echo
echo "* Unzipping it..."
unzip -q aws-sam-cli-linux-x86_64.zip
echo
if [ -f /usr/local/aws-sam-cli/current/bin/sam ]; then
    echo "* Current version:"
    /usr/local/aws-sam-cli/current/bin/sam --version
    echo "* Updating..."
    sudo ./install --update
else
    echo "* Installing..."
    sudo ./install
fi
echo
echo "* Installed version:"
sam --version
echo
echo "Resuming at original directory"
popd