func LookPath(file string) (string, error) {
	// NOTE(rsc): I wish we could use the Plan 9 behavior here
	// (only bypass the path if file begins with / or ./ or ../)
	// but that would not match all the Unix shells.

	if strings.Contains(file, "/") {
		err := findExecutable(file)
		if err == nil {
			return file, nil
		}
		return "", &Error{file, err}
	}
	path := os.Getenv("PATH")
	for _, dir := range filepath.SplitList(path) {
		if dir == "" {
			// Unix shell semantics: path element "" means "."
			dir = "."
		}
		path := filepath.Join(dir, file)
		if err := findExecutable(path); err == nil {
			return path, nil
		}
	}
	return "", &Error{file, ErrNotFound}
}
// LookPath searches for an executable named file in the
// directories named by the PATH environment variable.
// If file contains a slash, it is tried directly and the PATH is not consulted.
// The result may be an absolute path or a path relative to the current directory.
LookPath searches for an executable named file in the
directories named by the PATH environment variable.
If file contains a slash, it is tried directly and the PATH is not consulted.
The result may be an absolute path or a path relative to the current directory.
// LookPath searches for an executable named file in the // directories named by the PATH environment variable . // If file contains a slash it is tried directly and the PATH is not consulted . // The result may be an absolute path or a path relative to the current directory .
func LookPath(file string) (string, error) {
	if strings.Contains(file, "/") {
		err := findExecutable(file)
		if err == nil {
			return file, nil
		}
		return "", &Error{file, err}
	}
	path := os.Getenv("PATH")
	for _, dir := range filepath.SplitList(path) {
		if dir == "" {
			dir = "."
		}
		path := filepath.Join(dir, file)
		if err := findExecutable(path); err == nil {
			return path, nil
		}
	}
	return "", &Error{file, ErrNotFound}
}
func LookPath ( file string ) ( string , error ) { if strings . Contains ( file , " " ) { err := findExecutable ( file ) if err == nil { return file , nil } return " " , & Error { file , err } } path := os . Getenv ( " " ) for _ , dir := range filepath . SplitList ( path ) { if dir == " " { dir = " " } path := filepath . Join ( dir , file ) if err := findExecutable ( path ) ; err == nil { return path , nil } } return " " , & Error { file , ErrNotFound } }
LookPath searches for an executable named file in the
directories named by the PATH environment variable.
LookPath searches for an executable named file in the directories named by the PATH environment variable .
// NOTE(rsc): I wish we could use the Plan 9 behavior here // (only bypass the path if file begins with / or ./ or ../) // but that would not match all the Unix shells. // Unix shell semantics: path element "" means "."