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New implementation

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating resource.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
with Ada.Command_Line; use Ada.Command_Line;
with Ada.Directories; use Ada.Directories;
S : String := (Simple_Name (Command_Name));
#include <string.h>
#ifdef _WIN32
#define PATH_SEP '\\'
#else
#define PATH_SEP '/'
#endif

int main(int argc, char* argv[])
{
    char *s = strchr(argv[0], PATH_SEP);
    s = s ? s + 1 : argv[0];

    return 0;
}
#include <iostream>
#include <filesystem>
int main(int argc, char* argv[])
{
    std::cout << std::filesystem::path(argv[0]).filename() << '\n';
}
using System;
using System.IO;
var path=Environment.CommandLine;
var s=Path.GetFileName(path);
import std.path;
void main(string[] args) {
    string s = args[0].baseName;
}
program p
implicit none
character(len=:),allocatable :: s
integer                      :: stat,l,i,j,k
 call get_command_argument (0,length=l)
 allocate(character(len=l) :: s)
 call get_command_argument (0,s,status=stat)
 if (stat == 0) then
  i=index(s,'/',back=.true.)
  j=index(s,'\',back=.true.)
  k=max(i,j)
  if(k.ne.0)s=s(k+1:)
  print *, "The program's name is " // trim (s)
 endif
end program p
import "os"
import "path/filepath"
path := os.Args[0]
s = filepath.Base(path)
import System.Environment
s <- getProgName
var s = process.argv0;
String s = System.getProperty("sun.java.command");
s = arg[0]
$s = $_SERVER['PHP_SELF'];
s := ExtractFileName(ParamStr(0));
my $s = $0;
import sys
s = sys.argv[0]
s = __FILE__
s = $0
let s = std::env::current_exe()
    .expect("Can't get the exec path")
    .file_name()
    .expect("Can't get the exec name")
    .to_string_lossy()
    .into_owned();
fn get_exec_name() -> Option<String> {
    std::env::current_exe()
        .ok()
        .and_then(|pb| pb.file_name().map(|s| s.to_os_string()))
        .and_then(|s| s.into_string().ok())
}

fn main() -> () {
    let s = get_exec_name().unwrap();
    println!("{}", s);
}