golang执行build.sh脚本错误

build.sh脚本：

#!/bin/bash
set -ex

export GOPATH=/go
export GOPROXY="https://go-athens.tencent.net/repository/sz/,direct"
export GOSUMDB="off"
export GO111MODULE="on"
export GONOSUMDB="gitlab.tencent.com,gitlab.tencent.sz"
ls
pwd
go env

go build -o $1  ./cmd/main.go
ls

执行脚本，报错：

...
invalid $GOPROXY setting: cannot have comma
...

解决方案：
修改GOPROXY里面的内容为：

...
export GOPROXY="https://go-athens.tencent.net/repository/sz/"
...