yes. (this works in 5.x. I don't do much on 4.x)
Boot off of the CD, there should be a maintainance mode. Then you
should have the option to load the rootvg or boot before mounting
filesystems. Choose the first option. This should dump you at a prompt.

2 warnings:
First, AIX will only work with filesystems made at or below the patch
level of the version of AIX that you're booting off of. So for example
if I had a machine with AIX5.3ML3, and I booted off an AIX5.3ML2 CD, I
wouldn't be able to do any work with files. However If I had an AIX
5.3TL5 CD, I could load the files and work with them.
Second, maint mode tends to get confused about the terminal type, which
messes with vi . do an export TERM=vt100 and it should fix the term.
Good luck!

Blutwolf wrote:
> Hi,
>
> today i saved the passwd file with two spaces at the beginning, and i
> didn't check it afterwards. After rebooting the machine i have no way
> to log in into the system.
> Is there a way to get into a "single" user mode to fix the passwd file?
>
> Machine: RS/6000 233 MHz
> AIX 4.3.3.0
>
> Best Regards,
> Patrick

On 18 Jan., 17:39, "michael.shulman" wrote:
> yes. (this works in 5.x. I don't do much on 4.x)
> Boot off of the CD, there should be a maintainance mode. Then you
> should have the option to load the rootvg or boot before mounting
> filesystems. Choose the first option. This should dump you at a prompt.
>

Arg, but how can i boot into maintenace mode... the monitor gives me
out of range and pressing 5/f5 doesn't do anything..
Its an rs6000 43p-140.