#go env

?go env

GO111MODULE=""

GOARCH="amd64"

GOBIN=""

GOCACHE="/root/.cache/go-build"

GOENV="/root/.config/go/env"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GONOPROXY=""

GONOSUMDB=""

GOOS="linux"

GOPATH="/root/go"

GOPRIVATE=""

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/usr/lib/golang"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/usr/lib/golang/pkg/tool/linux_amd64"

GCCGO="gccgo"

AR="ar"

CC="gcc"

CXX="g++"

CGO_ENABLED="1"

GOMOD=""

CGO_CFLAGS="-g -O2"

CGO_CPPFLAGS=""

CGO_CXXFLAGS="-g -O2"

CGO_FFLAGS="-g -O2"

CGO_LDFLAGS="-g -O2"

PKG_CONFIG="pkg-config"

GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build807826116=/tmp/go-build -gno-record-gcc-switches"

# modity? /etc/profile

append /etc/profile

#GoRoot

export GOROOT=/usr/lib/golang

#gopath

export GOPATH=/root/go

#gopath bin

export PATH=$PATH:$GOROOT/bin:$GOPATH/bin

#source /etc/profile

#go version

go version go1.13.15 linux/amd64

#test go env

vi hello.go

write body to hello.go

#

package main

import "fmt"

func main(){

? ?fmt.Println("Hello World by \"hi dachan\"!")

}

# go build hello.go

#./hello

Hello World by "hi dachan"!

#go run hello.go

Hello World by "hi dachan"!