Where did my app start from

whereami.go

package main

import (
	"fmt"
	"log"
	"os"
	"path/filepath"
)

func main() {
	// Returns the PWD of the shell invoking the binary
	curdir, err := os.Getwd()
	if err != nil {
		log.Fatalf("fatal error: %s\n", err)
	}
	fmt.Printf("the working dir is %s\n", curdir)

	// This one isn't great
	curdir2 := filepath.Dir(os.Args[0])
	fmt.Printf("the working dir is %s\n", curdir2)

	// Also returns the PWD of the shell invoking the binary
	curdir3, err := filepath.Abs(filepath.Dir(os.Args[0]))
	if err != nil {
		log.Fatalf("fatal error: %s\n", err)
	}
	fmt.Printf("the working dir is %s\n", curdir3)

	// This will get the path of the binary itself
	curdir4, err := os.Executable()
	if err != nil {
		log.Fatalf("fatal error: %s\n", err)
	}
	curdir4 = filepath.Dir(curdir4)
	fmt.Printf("the working dir is %s\n", curdir4)
}

curdir / curdir3 are useful for getting the path of where the shell or whatever is when it launches the binary.

curdur4 is useful for finding out the path of where the binary itself is.