Listing 2 from http://www.ibm.com/developerworks/library/l-gas-nasm/ translated to GNU as and written using intel syntax.

nasm2gas2.s

# Example adapted from http://www.ibm.com/developerworks/library/l-gas-nasm/
# Assemble with: as --gstabs+ -o nasm2gas2.o nasm2gas2.s 
# Link with ld -o nasm2gas2 nasm2gas2.o
# Check program return status with "echo $?"
#
# Support intel syntal vs. ATT and don't use % before register names
.intel_syntax noprefix

.section .data

    var1: .int 40
    var2: .int 20
    var3: .int 30

.section .text

# Program entry point
.globl _start
_start:

# Move the contents of variables
    mov ecx, [var1]
    cmp ecx, [var2]
    jg check_third_var
    mov ecx, [var2]

check_third_var:
    cmp ecx, [var3]
    jg _exit
    mov ecx, [var3]

_exit:
    mov eax, 1
    mov ebx, ecx
    int 0x80