一键切换Golang版本

将各个版本统一在固定目录下，如：

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/usr/local/
├── ......
├── go -> /usr/local/go1.13.15
├── go1.16.3
├── go1.17.6
├── ......

然后在 bash启动脚本（比如Linux中为~/.bashrc） 中添加如下函数：

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function gouse() {
    if [[ $# -eq 0 ]]
    then
        echo "usage $FUNCNAME <go version(1.12,1.13,1.14,...)>"
        return
    fi
    local USER_LOCAL_DIR=/usr/local
    local targetGoVersion=$1
    local choice
    for GoVersion in ${USER_LOCAL_DIR}/go1.1*
    do
        if [[ ${GoVersion} =~ ${targetGoVersion} ]]
        then
            read -p "Shall I use ${GoVersion}? (y/Y | n/N) " -t 5 choice
            choice=$(echo $choice | tr 'A-Z' 'a-z')
            if [[ ${choice:0:1} == "y" ]]
            then
                sudo rm -rf ${USER_LOCAL_DIR}/go
                sudo ln -sf ${GoVersion} ${USER_LOCAL_DIR}/go
                return
            fi
            echo
        fi
    done
    echo "${targetGoVersion} not found in ${USER_LOCAL_DIR}"
}

source ~/.bashrc 使生效后，如果想要切换golang到 go1.16，直接如下执行命令即可

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$ gouse 1.16
Shall I use /usr/local/go1.16.3? (y/Y | n/N) y
$ go version
go version go1.16.3 linux/amd64