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Idiom #107 Get folder containing current program

Assign to string dir the path of the folder containing the currently running executable.
(This is not necessarily the working directory, though.)

from pathlib import Path
dir = str(Path(__file__).parent)
import os
dir = os.path.dirname(os.path.abspath(__file__))
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <linux/limits.h>
#include <libgen.h>

int main()
{
    char exe[PATH_MAX], real_exe[PATH_MAX];
    ssize_t r;
    char *dir;

    if ((r = readlink("/proc/self/exe", exe, PATH_MAX)) < 0)
      exit(1);
    if (r == PATH_MAX)
	r -= 1;
    exe[r] = 0;
    if (realpath(exe, real_exe) == NULL)
	exit(1);
    dir = dirname(real_exe);
    puts(dir);
}

dir = AppDomain.CurrentDomain.BaseDirectory;

import std.path;
void main(string[] args) {
    string dir = args[0].dirName;
}
import "os"
import "path/filepath"
programPath := os.Args[0]
absolutePath, err := filepath.Abs(programPath)
if err != nil {
	return err
}
dir := filepath.Dir(absolutePath)
import System.Environment (getExecutablePath)
import System.FilePath.Windows
dir <- takeDirectory `fmap` getExecutablePath
import System.Environment (getExecutablePath)
import System.FilePath.Windows
import System.IO.Unsafe (unsafePerformIO)
dir = unsafePerformIO (takeDirectory `fmap` getExecutablePath)
const dir = __dirname;
const path = require('path');
const dir = path.resolve();
dir = arg[1]
$dir = realpath(dirname(__FILE__));
uses SysUtils;
dir := GetCurrentDir;
dir := extractfilepath(paramstr(0));
use English qw($EXECUTABLE_NAME);
use Path::Tiny qw(path);

my $dir = path($EXECUTABLE_NAME)->parent;

dir = __dir__
let dir = std::env::current_exe()?
    .canonicalize()
    .expect("the current exe should exist")
    .parent()
    .expect("the current exe should be a file")
    .to_string_lossy()
    .to_owned();
New implementation...
< > ⌨
programming-idioms.org 
dir = str(Path(__file__).parent)
dir = os.path.dirname(os.path.abspath(__file__))
int main()
{
    char exe[PATH_MAX], real_exe[PATH_MAX];
    ssize_t r;
    char *dir;

    if ((r = readlink("/proc/self/exe", exe, PATH_MAX)) < 0)
      exit(1);
    if (r == PATH_MAX)
	r -= 1;
    exe[r] = 0;
    if (realpath(exe, real_exe) == NULL)
	exit(1);
    dir = dirname(real_exe);
    puts(dir);
}

dir = AppDomain.CurrentDomain.BaseDirectory;

void main(string[] args) {
    string dir = args[0].dirName;
}
programPath := os.Args[0]
absolutePath, err := filepath.Abs(programPath)
if err != nil {
	return err
}
dir := filepath.Dir(absolutePath)
dir <- takeDirectory `fmap` getExecutablePath
dir = unsafePerformIO (takeDirectory `fmap` getExecutablePath)
const dir = __dirname;
const dir = path.resolve();
dir = arg[1]
$dir = realpath(dirname(__FILE__));
dir := GetCurrentDir;
dir := extractfilepath(paramstr(0));
my $dir = path($EXECUTABLE_NAME)->parent;

dir = __dir__
let dir = std::env::current_exe()?
    .canonicalize()
    .expect("the current exe should exist")
    .parent()
    .expect("the current exe should be a file")
    .to_string_lossy()
    .to_owned();