; You need to have NASM in your Linux PC 
; To install NASM : apt-get nasm    or  yum install nasm
; How to compile and run  ( I have tested on 32 bit Fedora Linux)
; $ nasm -f elf -l hello.1st hello.asm 
; $ gcc -o hello hello.o
; $ ./hello 
;	 Hello World 
; $

SECTION .data		; data section
msg:	db "Hello World",10	; the string to print, 10=cr
len:	equ $-msg		; "$" means "here"
				; len is a value, not an address

SECTION .text		; code section
        global main		; make label available to linker 
main:				; standard  gcc  entry point
	
	mov	edx,len		; arg3, length of string to print
	mov	ecx,msg		; arg2, pointer to string
	mov	ebx,1		; arg1, where to write, screen
	mov	eax,4		; write sysout command to int 80 hex
	int	0x80		; interrupt 80 hex, call kernel
	
	mov	ebx,0		; exit code, 0=normal
	mov	eax,1		; exit command to kernel
	int	0x80		; interrupt 80 hex, call kernel