Source: lp_unix.go in package os/exec

Source File
	lp_unix.go

Belonging Package
	os/exec

+build aix darwin dragonfly freebsd linux netbsd openbsd solaris


package exec

import (
	"errors"
	"io/fs"
	"os"
	"path/filepath"
	"strings"
)

ErrNotFound is the error resulting if a path search failed to find an executable file.

var ErrNotFound = errors.New("executable file not found in $PATH")

func findExecutable(file string) error {
	d, err := os.Stat(file)
	if err != nil {
		return err
	}
	if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
		return nil
	}
	return fs.ErrPermission
}

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.

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) {

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}


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