Masoud’s notes about Golang – Part 2

when you want to run or build a go file it needs to be the main package (I’ll write more about packages in go later).

let’s div into example code

package main
import "fmt"

func main(){

	for i := 0 ; i <= 500 ; i++{
		s := ""
		
		if i % 7 == 0{
			s = "Haftaeiash"
		}
		if i % 3 == 0{
			s = "Setayi"
		}
		if s != "" {
			fmt.Println(s)
		}else{
			fmt.Println(i)
		}
	}
}

To run package :

go run masoud.go

To check out environments :

go env

GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/masoud/.cache/go-build"
GOENV="/home/masoud/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/masoud/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/masoud/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/lib/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.18.3"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
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-build3281051355=/tmp/go-build -gno-record-gcc-switches"

By default it prints the list as a shell script; however, if one or more variable names are given as arguments, it prints the value of each named variable.

$go env GOOS GOPATH
linux
/home/yourname