It's documented in the man page under Subcommands -> zfs list:

> -o property
> (omitted)
>    •   The value space to display space usage properties on file systems and volumes.  This is a shortcut for specifying -o name,avail,used,usedsnap,usedds,usedrefreserv,usedchild -t filesystem,volume syntax.

On 17/6/20 6:38 pm, Daniel Shahaf wrote:
> Thanks for the patch.
> 
> I see that «zfs list -o space» works, but I don't see any reference to
> the value «space» in the help output (`zfs list -o foobar 2>&1`) or man
> page.  Is that value supported and undocumented?  Or is it undocumented
> because it's deprecated?
> 
> workers@, could someone take over the review, please?  I have a few
> patches to finish and don't want to spread myself too thin.
> 
> Cheers,
> 
> Daniel
> 
> 
> Frederick Zhang wrote on Fri, 05 Jun 2020 18:11 +1000:
>> Signed-off-by: Frederick Zhang <frederick888@tsundere.moe>
>> ---
>>  Completion/Unix/Command/_zfs | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> Although it's only documented under 'zfs list', it seems to be available
>> to other subcommands as well, e.g. 'zfs get'.
>>
>> diff --git a/Completion/Unix/Command/_zfs b/Completion/Unix/Command/_zfs
>> index 814358bc7..452e1160d 100644
>> --- a/Completion/Unix/Command/_zfs
>> +++ b/Completion/Unix/Command/_zfs
>> @@ -132,9 +132,9 @@ _zfs() {
>>  	)
>>  
>>  	# TODO: userused@ and groupused@ could have more extensive handling
>>  	ro_properties=(
>> -		"name" "type" "creation" "used" "available" "referenced"
>> +		"name" "type" "creation" "space" "used" "available" "referenced"
>>  		"compressratio" "mounted" "origin" "usedbychildren"
>>  		"usedbydataset" "usedbyrefreservation" "usedbysnapshots"
>>  		"defer_destroy" "userused@" "userrefs" "groupused@"
>>  		"keychangedate" "keystatus" "rekeydate"
> 

-- 
Best regards,
Frederick Zhang

Email: frederick888@tsundere.moe
PGP:   8BFB EA5B 4C44 BFAC C8EC 5F93 1F92 8BE6 0D8B C11D