Maybe try this first?  Create a NEW admin user, use the new user to massage the 
old user's account.  (Follow the first link as well.)

https://apple.stackexchange.com/questions/226073/how-do-i-create-user-accounts-from-the-terminal-in-mac-os-x-10-11
 
<https://apple.stackexchange.com/questions/226073/how-do-i-create-user-accounts-from-the-terminal-in-mac-os-x-10-11>


> On Aug 3, 2017, at 11:06 AM, Chris Walker <[email protected]> wrote:
> 
> It’s not my machine.  A friend acts as Admin for his parents machine - an 
> iMac that dates from Snow Leopard or thereabouts which has been updated 
> several times. For this reason I doubt there is a recovery partition.   It 
> now boasts about 24Meg Ram and has had a larger hard drive.  Probably the 
> last upgradeable iMac before they went ‘thin’ and glued everything up.  
> 
> Somehow his parents have managed to corrupt the admin password - they insist 
> they haven’t changed anything - but either way he can’t do anything that 
> requires an admin password.  
> 
> I suppose we could try booting from one of his machines which should show the 
> iMac drive as a bootable drive on the desktop.  No idea whether that would 
> advance anything.
> 
> I suspect Macs R We is correct.  A deep breath and dive into single-user boot 
> is probably best, but do a clone to another drive beforehand.  Since I’m not 
> familiar with terminal commands, I’m guessing you substitute the actual name 
> for ‘usershortname’ in "chpass newpassword usershortname”.
> 
> Can’t see why that wouldn’t work, but computers can be very obtuse…
> 
> Thanks for the help folks.  I’ll pass it all on.
> 
> Chris
> 
> 
> 
>> On 3 Aug 2017, at 18:34, Macs R We <[email protected]> wrote:
>> 
>> Anything he could do from Target Disk Mode he could do more simply from a 
>> single-user boot (command-s).  But he'd have to know the right commands, and 
>> how many other linked data structures he'd have to change to make the user 
>> account work.  If you have absolutely no other choice, I'd do a single-user 
>> boot, then use "chpass newpassword usershortname", and hope it does enough 
>> to at least let you in.
>> 
>>> On Aug 3, 2017, at 10:26 AM, Chris Walker <[email protected]> wrote:
>>> 
>>> Not sure there’s a recovery partition on this machine since I think it’s 
>>> been upgraded from somewhere around Snow Leopard, unless one of the 
>>> upgrades created one somewhere.
>>> 
>>> Instead could he use target disk mode in any way?
>>> 
>>> Chris
>>> 
>>>> On 3 Aug 2017, at 18:19, Macs R We <[email protected]> wrote:
>>>> 
>>>> The standard way is to boot into the recovery partition, use the Tools 
>>>> option to launch Terminal, then there is a simple command (not chpass, 
>>>> something custom) you use to reset the password.  Sorry I don't remember 
>>>> the exact command, but I'm positive this is Googleable.
>>>> 
>>>>> On Aug 3, 2017, at 9:17 AM, Chris Walker <[email protected]> wrote:
>>>>> 
>>>>> Hi all:
>>>>> 
>>>>> Is it possible to re-set the admin password on El-Cap?  I know it was 
>>>>> possible to do a re-set on some versions of OSX but can’t find any 
>>>>> information on how to do it on El-Cap.
>>>>> 
>>>>> 
>>>>> Chris
>>>>> _______________________________________________
>>>>> MacOSX-talk mailing list
>>>>> [email protected]
>>>>> http://www.omnigroup.com/mailman/listinfo/macosx-talk
>>>> 
>>> 
>> 
> 

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