Listing 1 from http://www.ibm.com/developerworks/library/l-gas-nasm/ translated to GNU as and written using intel syntax.

nasm2gas1.s

# Example adapted from http://www.ibm.com/developerworks/library/l-gas-nasm/
# Assemble with: as --gstabs+ -o nasm2gas1.o nasm2gas1.s
# Link with: ld -o nasm2gas1 nasm2gas1.o
# Check program return status with "echo $?"
#
# Support intel syntal vs. ATT and don't use % before register names
.intel_syntax noprefix

.section .text

# Program entry point
.globl _start
_start:

# Put the code number for system call
    mov eax, 1

# Return value. Check returned value with "echo $?" on command line
    mov ebx, 2

# Call the OS
    int 0x80