update-go.sh

#!/usr/bin/env bash
set -euo pipefail

last_go_version() {
    curl -s https://go.dev/dl/ |
        grep linux-amd64 |
        grep span |
        awk -F">" '{ print $2 }' |
        awk -F"<" '{ print $1 }'
}

print_info() {
    echo "INFO: $1"
}

check_go_in_path() {
    if ! echo "$PATH" | grep -q "/go/bin"; then
        print_info "Add ${HOME}/go/bin and /usr/local/go/bin to PATH"
    fi
}

(
    cd ~/Downloads
    check_go_in_path
    go version

    file=$(last_go_version)
    if [[ ! -e "$file" ]]; then
        wget "https://go.dev/dl/${file}"
        sudo rm -rf /usr/local/go
        sudo tar -C /usr/local -xzf "$file"
    else
        print_info "${file} already downloaded"
    fi

    go version
)