Linux Assembler

I'm following a tutorial @ http://www.geocities.com/SiliconVall.../linux-asm.txt
however, the second program (command line arguments) example apparently has an error in it.

The line is:

Code:

---

movb (%ecx,%edx,$1), %al

---

Does anyone see anything wrong with that? It's the line `as' flags as having an error.

The entire program:

Code:

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########################################################################
        .section .data

new_line_char:
        .byte 0x0a
########################################################################
        .section .text

        .globl _start

        .align 4
_start:
        movl %esp, %ebp                # store %esp in %ebp
again:
        addl $4, %esp                # %esp ---> next parameter on stack
        movl (%esp), %eax        # move next parameter into %eax
        testl %eax, %eax        # %eax (parameter) == NULL pointer?
        jz end_again                # get out of loop if yes
        call putstring                # output parameter to stdout.
        jmp again                # repeat loop
end_again:
        xorl %eax, %eax                # %eax = 0
        incl %eax                # %eax = 1, system call _exit ()
        xorl %ebx, %ebx                # %ebx = 0, normal program exit.
        int $0x80                # execute _exit () system call

putstring:        .type @function
        pushl %ebp
        movl %esp, %ebp
        movl 8(%ebp), %ecx
        xorl %edx, %edx
count_chars:
        movb (%ecx,%edx,$1), %al
        testb %al, %al
        jz done_count_chars
        incl %edx
        jmp count_chars
done_count_chars:
        movl $4, %eax
        xorl %ebx, %ebx
        incl %ebx
        int $0x80
        movl $4, %eax
        leal new_line_char, %ecx
        xorl %edx, %edx
        incl %edx
        int $0x80
        movl %ebp, %esp
        popl %ebp
        ret

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Any help on this would be greatly appreciated.

Getting interest on asm in Linux. ..
zero knowledge to help you. I guess you will find one to help you.

Now tell tell me, how did you start asm...

Give me some online sources. First how to compile code. Then if any tutorial.. I have visited the above url already.

Have you tried here

What is the error? This shoudl be a valid AT&T ASM Syntax line. Although I have not done much ASM in awhile.