Re: Bug in lsblk command or man page?

[David O'Brien <daobrien@redhat.com>]

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On 1/5/21 8:27 PM, Karel Zak wrote:
> On Thu, Dec 24, 2020 at 11:14:04AM +1000, David O'Brien wrote:
>> I don't know if this is expected or not, but it seems very odd:
>>
>> # lsblk -o=UUID /stratis/labpool/labfs
>> lsblk: unknown column: =UUID
>>
>> [root@serverb ~]# lsblk -o UUID /stratis/labpool/labfs
>> UUID
>> 0118efb8-66fe-406a-837c-725961bdad4d
>>
>> [root@serverb ~]# lsblk --output=UUID /stratis/labpool/labfs
>> UUID
>> 0118efb8-66fe-406a-837c-725961bdad4d
>>
>>
>> From the man(8) page:
>> -o, --output list
>>               Specify which output columns to print.  Use --help to get
>>               a list of all supported columns.  The columns may affect
>>               tree-like output.  The default is to use tree for the
>>               column 'NAME' (see also --tree).
>>
>>               The default list of columns may be extended if list is
>>               specified in the format +list (e.g., lsblk -o +UUID).
>>
>> There is no mention of "=" being required, causing failures, etc. I found this quite frustrating.
>>
> 
> This is common getopt_long() behavior where equal sign is usable only for
> long options (and sometimes for optional arguments).
> 
>  lsblk -o UUID
>  lsblk --output UUID
>  lsblk --output=UUID
> 
> this is how "=" works in almost all commands and I don't see reason
> why we need to be explicit about it for "lsblk -o".
> 
>     Karel
> 
ok. If it's common and expected that's fine. I don't spend a lot of time with this class/type of command and it was just
new to me and seemed odd.

cheers
-- 
David
Introvert/Unclubbable/Cool

Red Hat's core values are freedom, courage, commitment, and accountability.


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