linux设置环境变量GOPATH

vim /etc/profile

export GOROOT=/usr/local/go  #设置为go安装的路径，有些安装包会自动设置默认的goroot
export GOPATH=$PATH:/root/go   #默认安装包的路径
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin

source /etc/profile