goinit.sh

#!/bin/bash
green=`tput setaf 2`
reset=`tput sgr0`
         #getting the arch
        if [[ "$OSTYPE" = *"darwin"* ]]; then
        arch="darwin"
        elif $(uname -m | grep '64'); then
        arch="64"
        else
        arch="32"
        fi

        #getting which shell script running
        if [ -n "`$SHELL -c 'echo $ZSH_VERSION'`" ]; then
            # assume Zsh
            shell_profile="zshrc"
        elif [ -n "`$SHELL -c 'echo $BASH_VERSION'`" ]; then
            # assume Bash
            shell_profile="bashrc"
        fi
if [ $# -eq 0 ]; then
     options=("1.8" "1.9.1" "1.9.2" "1.9.3" "1.9.4" "1.9.5" "1.9.6" "1.9.7" "1.10.1" "1.10.2" "1.10.3" "1.11.8" "1.12.3")

        #allow user to select whichever ver they wish
        echo "Select one of the golang's version from below.."
        echo "ex- 1 for 1.8"
        select download_version in "${options[@]}"
        do
            echo "$download_version selected"
            break
        done

        #getting the arch
        if [[ "$OSTYPE" = *"darwin"* ]]; then
        download_file="go$download_version.darwin-amd64.tar.gz"
        elif $(uname -m | grep '64'); then
        download_file="go$download_version.linux-amd64.tar.gz"
        else
        download_file="go$download_version.linux-386.tar.gz"
        fi

        #getting which shell script running
        if [ -n "`$SHELL -c 'echo $ZSH_VERSION'`" ]; then
            # assume Zsh
            shell_profile="zshrc"
        elif [ -n "`$SHELL -c 'echo $BASH_VERSION'`" ]; then
            # assume Bash
            shell_profile="bashrc"
        fi

        #checking if install dirs aren't pre-occupied
        if [ -d "$HOME/go" ] || [ -d "$HOME/goworkspace" ]; then
            echo "The 'goworkspace' or 'go' directories already exist. Exiting."
            exit 1
        fi

        if [[ ! -e $HOME/goworkspace ]]; then
            mkdir $HOME/goworkspace
        elif [[ ! -d $dir ]]; then
            echo "$HOME/goworkspace already exists but is not a directory" 1>&2
        fi

        if [[ ! -e $HOME/go ]]; then
            mkdir $HOME/go
        elif [[ ! -d $dir ]]; then
            echo "$HOME/go already exists but is not a directory" 1>&2
        fi

        echo "Downloading $download_file ...."
        wget https://storage.googleapis.com/golang/$download_file -O /tmp/go.tar.gz 2>/dev/null || curl https://storage.googleapis.com/golang/$download_file --output /tmp/go.tar.gz

        if [ $? -ne 0 ]; then
            echo "Download failed! Exiting."
            exit 1
        fi


        echo "Extracting File..."
        tar -C "$HOME" -xzf /tmp/go.tar.gz
        mv "$HOME/goworkspace" "$HOME/go"
        touch "$HOME/.${shell_profile}"

        echo -e "\nSetting GOPATH GOROOT......"
        {
            echo '# GoLangConfig '
            echo 'export GOROOT=$HOME/go'
            echo 'export PATH=$PATH:$GOROOT/bin'
            echo 'export GOPATH=$HOME/goworkspace'
            echo 'export PATH=$PATH:$GOPATH/bin'
        } >> "$HOME/.${shell_profile}"

        echo -e "\nMaking src, pkg and bin inside goworkspace"
        mkdir -p $HOME/goworkspace/{src,pkg,bin}
        echo -e "\n${green} Go $download_version was installed${reset}"
        echo "Run source $HOME/.${shell_profile} or open a new terminal window to test it."
        rm -f /tmp/go.tar.gz
else 
         #in mac systems sed requires extra '' 
        if [ "$arch" = "darwin" ]; then
            rm -rf "$HOME/go/"
            rm -rf "$HOME/goworkspace/"
            sed -i '' '/# GoLangConfig/d' "$HOME/.${shell_profile}"
            sed -i '' '/export GOROOT/d' "$HOME/.${shell_profile}"
            sed -i '' '/:$GOROOT/d' "$HOME/.${shell_profile}"
            sed -i '' '/export GOPATH/d' "$HOME/.${shell_profile}"
            sed -i '' '/:$GOPATH/d' "$HOME/.${shell_profile}"
            echo "Go removed."
        else
            rm -rf "$HOME/go/"
            rm -rf "$HOME/goworkspace/"
            sed -i '/# GoLangConfig/d' "$HOME/.${shell_profile}"
            sed -i '/export GOROOT/d' "$HOME/.${shell_profile}"
            sed -i '/:$GOROOT/d' "$HOME/.${shell_profile}"
            sed -i '/export GOPATH/d' "$HOME/.${shell_profile}"
            sed -i '/:$GOPATH/d' "$HOME/.${shell_profile}"
            echo "Go removed."
        fi
fi