golang

path.go

/*
 put this script in the path like
 assumed /tmp (cwd)
 /tmp/dir1/dir2/path.go
 /tmp/dir3 symlinked to /tmp/dir1/dir2

 and run with
 gorun ../tmp/dir3/path.go

 or build path.go and run with ../tmp/dir3/path
*/

package main

import "os"
import "fmt"
import "path/filepath"

func main() {

    p := os.Args[0]
    var s string

    fmt.Printf("original: %s\n", p)

    s = filepath.Clean(p)
    fmt.Printf("normpath: %v\n", s)

    s, _ = filepath.Abs(p)
    fmt.Printf("abspath: %v\n", s)

    s, _ = filepath.EvalSymlinks(p)
    s, _ = filepath.Abs(s)
    fmt.Printf("realpath: %v\n", s)

    s, _ = os.Getwd()
    s = filepath.Join(s, p)
    fmt.Printf("normpath(join(getcwd(), p): %v\n", s)
}

path.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# put this script in the path like
# assumed /tmp (cwd)
# /tmp/dir1/dir2/path.py
# /tmp/dir3 symlinked to /tmp/dir1/dir2
#
# and run with
# python ../tmp/hello3/path.py

from os import getcwd
from os.path import normpath, abspath, realpath, join
import sys

p = sys.argv[0]

print "origin: %s" % p
print "normpath: %s" % normpath(p)
print "abspath: %s" % abspath(p)
print "realpath: %s" % realpath(p)
print "normpath(join(getcwd(), p): %s" % normpath(join(getcwd(), p))