// Package env contains functions for dealing with environment variablespackage env import (	"os" 	homedir "github.com/mitchellh/go-homedir") // ShellExpandHelp describes what ShellExpand does for inclusion into helpconst ShellExpandHelp = "\n\nLeading `~` will be expanded in the file name as will environment variables such as `${RCLONE_CONFIG_DIR}`.\n" // ShellExpand replaces a leading "~" with the home directory" and// expands all environment variables afterwards.func ShellExpand(s string) string {	if s != "" {		if s[0] == '~' {			newS, err := homedir.Expand(s)			if err == nil {				s = newS			}		}		s = os.ExpandEnv(s)	}	return s}