section	.text
   global _start         ;must be declared for using gcc

_start:                  ;tell linker entry point
   ;create the file
   mov  eax, 8
   mov  ebx, file_name
   mov  ecx, 0777        ;read, write and execute by all
   int  0x80             ;call kernel

   mov [fd_out], eax

   ; write into the file
   mov	edx,len          ;number of bytes
   mov	ecx, msg         ;message to write
   mov	ebx, [fd_out]    ;file descriptor
   mov	eax,4            ;system call number (sys_write)
   int	0x80             ;call kernel

   ; close the file
   mov eax, 6
   mov ebx, [fd_out]

   ; write the message indicating end of file write
   mov eax, 4
   mov ebx, 1
   mov ecx, msg_done
   mov edx, len_done
   int  0x80

   ;open the file for reading
   mov eax, 5
   mov ebx, file_name
   mov ecx, 0             ;for read only access
   mov edx, 0777          ;read, write and execute by all
   int  0x80

   mov  [fd_in], eax

   ;read from file
   mov eax, 3
   mov ebx, [fd_in]
   mov ecx, info
   mov edx, 26
   int 0x80

   ; close the file
   mov eax, 6
   mov ebx, [fd_in]
   int  0x80

   ; print the info
   mov eax, 4
   mov ebx, 1
   mov ecx, info
   mov edx, 26
   int 0x80

   mov	eax,1             ;system call number (sys_exit)
   int	0x80              ;call kernel

section	.data
file_name db 'myfile.txt'
msg db 'Welcome to Tutorials Point'
len equ  $-msg

msg_done db 'Written to file', 0xa
len_done equ $-msg_done

section .bss
fd_out resb 1
fd_in  resb 1
info resb  26