go学习笔记：安装并运行hello world

通过homebrew安装go

brew update
brew install go

查看安装的路径：

➜  ~ which go
/usr/local/bin/go

添加环境变量

编辑~/.zshrc

export GOROOT=/usr/local/opt/go/libexec
export GOPATH=$HOME/go
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin

保存后执行

source ~/.zshrc

在终端环境运行go程序

新建文件hello.go，编辑如下并保存

~/code/go/src/hello.go

// hello.go
package main
import "fmt"

func main() {
  fmt.Printf("Hello, world!")
}

go run

在终端执行

cd ~/code/go/src/hello.go
go run hello.go

go build

也可以先用build命令编译，再执行

go build hello.go  //生成可执行文件hello
./hello

go tool objdump 查看执行过程

https://golang.org/cmd/objdump/
Objdump prints a disassembly of all text symbols (code) in the binary. If the -s option is present, objdump only disassembles symbols with names matching the regular expression.

go build hello.go
go tool objdump -s "main\.main" hello

参考

https://golang.org/doc/install?download=go1.8.1.darwin-amd64.pkg