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:

########################################################################
	.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

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.