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Groups > comp.os.linux.misc > #75680 > unrolled thread

Hmm ... Where Does "lsblk" Get It's Info From ?

Started byc186282 <c186282@nnada.net>
First post2025-10-04 02:18 -0400
Last post2025-10-13 03:06 -0400
Articles 20 on this page of 35 — 13 participants

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  Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-04 02:18 -0400
    Re: Hmm ... Where Does "lsblk" Get It's Info From ? The Natural Philosopher <tnp@invalid.invalid> - 2025-10-04 08:04 +0100
      Re: Hmm ... Where Does "lsblk" Get It's Info From ? Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-04 08:22 +0000
        Re: Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-04 22:39 -0400
    Re: Hmm ... Where Does "lsblk" Get It's Info From ? Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-10-05 18:17 +0200
    Re: Hmm ... Where Does "lsblk" Get It's Info From ? apapmurray <apap.murray@mail.com> - 2025-10-11 14:09 +0100
      Re: Hmm ... Where Does "lsblk" Get It's Info From ? Nuno Silva <nunojsilva@invalid.invalid> - 2025-10-11 23:39 +0100
        Re: Hmm ... Where Does "lsblk" Get It's Info From ? Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-10-12 00:28 +0000
          Re: Hmm ... Where Does "lsblk" Get It's Info From ? "Carlos E.R." <robin_listas@es.invalid> - 2025-10-12 02:46 +0200
            Re: Hmm ... Where Does "lsblk" Get It's Info From ? Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-12 00:51 +0000
            Re: Hmm ... Where Does "lsblk" Get It's Info From ? Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-10-12 11:18 +0000
        Re: Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-11 22:42 -0400
          Re: Hmm ... Where Does "lsblk" Get It's Info From ? Jim Jackson <jj@franjam.org.uk> - 2025-10-12 10:28 +0000
            Re: Hmm ... Where Does "lsblk" Get It's Info From ? The Natural Philosopher <tnp@invalid.invalid> - 2025-10-12 12:20 +0100
              Re: Hmm ... Where Does "lsblk" Get It's Info From ? rbowman <bowman@montana.com> - 2025-10-12 18:52 +0000
      Re: Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-11 21:38 -0400
        Re: Hmm ... Where Does "lsblk" Get It's Info From ? Andy Burns <usenet@andyburns.uk> - 2025-10-12 08:25 +0100
          Re: Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-13 03:20 -0400
            Re: Hmm ... Where Does "lsblk" Get It's Info From ? Andy Burns <usenet@andyburns.uk> - 2025-10-13 08:33 +0100
              Re: Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-13 03:51 -0400
              Re: Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-13 03:53 -0400
                Re: Hmm ... Where Does "lsblk" Get It's Info From ? Andy Burns <usenet@andyburns.uk> - 2025-10-13 09:38 +0100
                  Re: Hmm ... Where Does "lsblk" Get It's Info From ? The Natural Philosopher <tnp@invalid.invalid> - 2025-10-13 10:22 +0100
              Re: Hmm ... Where Does "lsblk" Get It's Info From ? "Carlos E.R." <robin_listas@es.invalid> - 2025-10-13 10:40 +0200
                Re: Hmm ... Where Does "lsblk" Get It's Info From ? Andy Burns <usenet@andyburns.uk> - 2025-10-13 09:56 +0100
                  Re: Hmm ... Where Does "lsblk" Get It's Info From ? "Carlos E.R." <robin_listas@es.invalid> - 2025-10-13 11:45 +0200
                    Re: Hmm ... Where Does "lsblk" Get It's Info From ? The Natural Philosopher <tnp@invalid.invalid> - 2025-10-13 11:32 +0100
                      Re: Hmm ... Where Does "lsblk" Get It's Info From ? Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-13 21:21 +0000
                        Re: Hmm ... Where Does "lsblk" Get It's Info From ? John Ames <commodorejohn@gmail.com> - 2025-10-13 14:34 -0700
                    Re: Hmm ... Where Does "lsblk" Get It's Info From ? Andy Burns <usenet@andyburns.uk> - 2025-10-13 11:38 +0100
                      Re: Hmm ... Where Does "lsblk" Get It's Info From ? Andy Burns <usenet@andyburns.uk> - 2025-10-13 11:45 +0100
                        Re: Hmm ... Where Does "lsblk" Get It's Info From ? "Carlos E.R." <robin_listas@es.invalid> - 2025-10-13 13:05 +0200
      Re: Hmm ... Where Does "lsblk" Get It's Info From ? The Natural Philosopher <tnp@invalid.invalid> - 2025-10-12 12:19 +0100
        Re: Hmm ... Where Does "lsblk" Get It's Info From ? rbowman <bowman@montana.com> - 2025-10-12 18:58 +0000
      Re: Hmm ... Where Does "lsblk" Get It's Info From ? c186282 <c186282@nnada.net> - 2025-10-13 03:06 -0400

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#75680 — Hmm ... Where Does "lsblk" Get It's Info From ?

Fromc186282 <c186282@nnada.net>
Date2025-10-04 02:18 -0400
SubjectHmm ... Where Does "lsblk" Get It's Info From ?
Message-ID<rsadnRrcKZC9IX31nZ2dnZfqn_adnZ2d@giganews.com>
Easy enough to find what's mounted at the moment, but
you need 'lsblk' to find what CAN possibly be mounted.

Where/how does 'lsblk' get its info ???

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#75685

FromThe Natural Philosopher <tnp@invalid.invalid>
Date2025-10-04 08:04 +0100
Message-ID<10bqgtk$2am7p$4@dont-email.me>
In reply to#75680
On 04/10/2025 07:18, c186282 wrote:
> Easy enough to find what's mounted at the moment, but
> you need 'lsblk' to find what CAN possibly be mounted.
> 
> Where/how does 'lsblk' get its info ???
> 
Look at the source and find out?

-- 
Climate Change: Socialism wearing a lab coat.

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#75686

FromLawrence D’Oliveiro <ldo@nz.invalid>
Date2025-10-04 08:22 +0000
Message-ID<10bqlgl$2brde$1@dont-email.me>
In reply to#75685
/sys/block

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#75717

Fromc186282 <c186282@nnada.net>
Date2025-10-04 22:39 -0400
Message-ID<KiydnT1tdvbyR3z1nZ2dnZfqn_adnZ2d@giganews.com>
In reply to#75686
On 10/4/25 04:22, Lawrence D’Oliveiro wrote:
> /sys/block

   Thank you - straight-up quick answer.

   /sys/block/<whatever> IS a bit messy to navigate/parse
   alas.

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#75721

FromMarc Haber <mh+usenetspam1118@zugschl.us>
Date2025-10-05 18:17 +0200
Message-ID<10bu5nb$120i0$1@news1.tnib.de>
In reply to#75680
c186282 <c186282@nnada.net> wrote:
>Easy enough to find what's mounted at the moment, but
>you need 'lsblk' to find what CAN possibly be mounted.
>
>Where/how does 'lsblk' get its info ???

The problem was already solved. So all I can add is that strace would
have been helpful here.

Greetings
Marc
-- 
----------------------------------------------------------------------------
Marc Haber         |   " Questions are the         | Mailadresse im Header
Rhein-Neckar, DE   |     Beginning of Wisdom "     | 
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fon: *49 6224 1600402

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#75943

Fromapapmurray <apap.murray@mail.com>
Date2025-10-11 14:09 +0100
Message-ID<10cdkv2$pc59$1@dont-email.me>
In reply to#75680
On 04/10/2025 07:18, c186282 wrote:
> Easy enough to find what's mounted at the moment, but
> you need 'lsblk' to find what CAN possibly be mounted.
> 
> Where/how does 'lsblk' get its info ???
> 
I can't imagine asking a question like this on Usenet instead of just 
using a search engine.

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#75959

FromNuno Silva <nunojsilva@invalid.invalid>
Date2025-10-11 23:39 +0100
Message-ID<10cemau$13dfg$1@dont-email.me>
In reply to#75943
On 2025-10-11, apapmurray wrote:

> On 04/10/2025 07:18, c186282 wrote:
>> Easy enough to find what's mounted at the moment, but
>> you need 'lsblk' to find what CAN possibly be mounted.
>>
>> Where/how does 'lsblk' get its info ???
>>
> I can't imagine asking a question like this on Usenet instead of just
> using a search engine.

Especially in this age where at least some search engines keep getting
shittier?

Google, for example, might just provide a screenful of links to
ad-ridden content scrappers, and may "helpfully" include other spellings
of words making the search less specific (I think someone even got it to
include "extinct" when searching for "extant" or vice-versa). Not to
mention all the time such search engines seem to think a web search must
include videos and images.

-- 
Nuno Silva

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#75962

FromCharlie Gibbs <cgibbs@kltpzyxm.invalid>
Date2025-10-12 00:28 +0000
Message-ID<ZCCGQ.239931$xYr1.99262@fx14.iad>
In reply to#75959
On 2025-10-11, Nuno Silva <nunojsilva@invalid.invalid> wrote:

> On 2025-10-11, apapmurray wrote:
>
>> On 04/10/2025 07:18, c186282 wrote:
>>
>>> Easy enough to find what's mounted at the moment, but
>>> you need 'lsblk' to find what CAN possibly be mounted.
>>>
>>> Where/how does 'lsblk' get its info ???
>>
>> I can't imagine asking a question like this on Usenet instead of just
>> using a search engine.
>
> Especially in this age where at least some search engines keep getting
> shittier?
>
> Google, for example, might just provide a screenful of links to
> ad-ridden content scrappers, and may "helpfully" include other spellings
> of words making the search less specific (I think someone even got it to
> include "extinct" when searching for "extant" or vice-versa). Not to
> mention all the time such search engines seem to think a web search must
> include videos and images.

In a recent podcast, Cory Doctorow stated that Google is making their
searches less useful in order to make people work harder to find stuff.
They're being paid by the mouse click, so the more clicks the better
(for them).  It's part of what he calls the "enshittification" of the
Internet.

-- 
/~\  Charlie Gibbs                  |  Growth for the sake of
\ /  <cgibbs@kltpzyxm.invalid>      |  growth is the ideology
 X   I'm really at ac.dekanfrus     |  of the cancer cell.
/ \  if you read it the right way.  |    -- Edward Abbey

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#75965

From"Carlos E.R." <robin_listas@es.invalid>
Date2025-10-12 02:46 +0200
Message-ID<9carrlx2l1.ln2@Telcontar.valinor>
In reply to#75962
On 2025-10-12 02:28, Charlie Gibbs wrote:
> On 2025-10-11, Nuno Silva <nunojsilva@invalid.invalid> wrote:
> 
>> On 2025-10-11, apapmurray wrote:
>>
>>> On 04/10/2025 07:18, c186282 wrote:
>>>
>>>> Easy enough to find what's mounted at the moment, but
>>>> you need 'lsblk' to find what CAN possibly be mounted.
>>>>
>>>> Where/how does 'lsblk' get its info ???
>>>
>>> I can't imagine asking a question like this on Usenet instead of just
>>> using a search engine.
>>
>> Especially in this age where at least some search engines keep getting
>> shittier?
>>
>> Google, for example, might just provide a screenful of links to
>> ad-ridden content scrappers, and may "helpfully" include other spellings
>> of words making the search less specific (I think someone even got it to
>> include "extinct" when searching for "extant" or vice-versa). Not to
>> mention all the time such search engines seem to think a web search must
>> include videos and images.
> 
> In a recent podcast, Cory Doctorow stated that Google is making their
> searches less useful in order to make people work harder to find stuff.
> They're being paid by the mouse click, so the more clicks the better
> (for them).  It's part of what he calls the "enshittification" of the
> Internet.

Not going to happen. People are learning to ask an AI instead. In fact, 
many google searches have an answer by the google AI, which often gets 
results wrong, and you can not chat with it to refine the results.

Search engines like google are losing hits to the AIs. They are worried.
-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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#75966

FromLawrence D’Oliveiro <ldo@nz.invalid>
Date2025-10-12 00:51 +0000
Message-ID<10ceu31$157ko$2@dont-email.me>
In reply to#75965
On Sun, 12 Oct 2025 02:46:33 +0200, Carlos E.R. wrote:

> On 2025-10-12 02:28, Charlie Gibbs wrote:
>>
>> In a recent podcast, Cory Doctorow stated that Google is making their
>> searches less useful in order to make people work harder to find stuff.
>> They're being paid by the mouse click, so the more clicks the better
>> (for them).  It's part of what he calls the "enshittification" of the
>> Internet.
> 
> Not going to happen. People are learning to ask an AI instead.

AI services cost money (i.e. electricity bills) to provide. So don’t 
expect that to be a low/no-cost alternative -- certainly not for long.

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#75997

FromStéphane CARPENTIER <sc@fiat-linux.fr>
Date2025-10-12 11:18 +0000
Message-ID<68eb8e93$0$16819$426a74cc@news.free.fr>
In reply to#75965
Le 12-10-2025, Carlos E.R. <robin_listas@es.invalid> a écrit :
> On 2025-10-12 02:28, Charlie Gibbs wrote:
>> In a recent podcast, Cory Doctorow stated that Google is making their
>> searches less useful in order to make people work harder to find stuff.
>> They're being paid by the mouse click, so the more clicks the better
>> (for them).  It's part of what he calls the "enshittification" of the
>> Internet.
>
> Not going to happen. People are learning to ask an AI instead. In fact, 
> many google searches have an answer by the google AI, which often gets 
> results wrong, and you can not chat with it to refine the results.
>
> Search engines like google are losing hits to the AIs. They are worried.

The AI can't replace search engines for everything. There is a limit to
that. For example, 25% of Internet bandwidth is done for porn. And AI
can't help. So, they'll never been able to win more than 75% of search
engines marketplaces.

<https://ibb.co/kVfK0jL7>

OK, there are ways to circumvent that, but it's far more difficult for
knowledge guys to use search engines for that than to circumvent the
AI. And for the street guy, there is no way around.

-- 
Si vous avez du temps à perdre :
https://scarpet42.gitlab.io

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#75979

Fromc186282 <c186282@nnada.net>
Date2025-10-11 22:42 -0400
Message-ID<W-WcnRBsBfQCiHb1nZ2dnZfqnPhj4p2d@giganews.com>
In reply to#75959
On 10/11/25 18:39, Nuno Silva wrote:
> On 2025-10-11, apapmurray wrote:
> 
>> On 04/10/2025 07:18, c186282 wrote:
>>> Easy enough to find what's mounted at the moment, but
>>> you need 'lsblk' to find what CAN possibly be mounted.
>>>
>>> Where/how does 'lsblk' get its info ???
>>>
>> I can't imagine asking a question like this on Usenet instead of just
>> using a search engine.
> 
> Especially in this age where at least some search engines keep getting
> shittier?


   Gotta get past the damned ads first ...

   Then the clearly 'sponsored' links ...

   Now they all offer "AI" to schmooze you
   even better and probably build up a big
   search dossier that will be used against
   you by somebody eventually.

> Google, for example, might just provide a screenful of links to
> ad-ridden content scrappers, and may "helpfully" include other spellings
> of words making the search less specific (I think someone even got it to
> include "extinct" when searching for "extant" or vice-versa). Not to
> mention all the time such search engines seem to think a web search must
> include videos and images.

   Went through a lot of 'duck' pages, but did not
   see any straight-up stuff on where lsblk got
   all its info. Mostly just endless examples of
   the man page.

   DID get immediate, straight accurate, info in
   this forum however.

   Alas, still a lot of messy parsing of the
   dir contents ... would probably use Python
   rather than 'C' - slice dice and splice
   are easy with Python.

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#75988

FromJim Jackson <jj@franjam.org.uk>
Date2025-10-12 10:28 +0000
Message-ID<slrn10en0lk.3ud.jj@iridium.wf32df>
In reply to#75979
On 2025-10-12, c186282 <c186282@nnada.net> wrote:
> On 10/11/25 18:39, Nuno Silva wrote:
>> On 2025-10-11, apapmurray wrote:
>> 
>>> On 04/10/2025 07:18, c186282 wrote:
>>>> Easy enough to find what's mounted at the moment, but
>>>> you need 'lsblk' to find what CAN possibly be mounted.
>>>>
>>>> Where/how does 'lsblk' get its info ???
>>>>
>>> I can't imagine asking a question like this on Usenet instead of just
>>> using a search engine.
>> 
>> Especially in this age where at least some search engines keep getting
>> shittier?
>
>
>    Gotta get past the damned ads first ...

Ads, what ads? Ublockorigin seems to do a good job, the few times I 
resort to using google, or youtube.

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#75999

FromThe Natural Philosopher <tnp@invalid.invalid>
Date2025-10-12 12:20 +0100
Message-ID<10cg2ts$1dscj$7@dont-email.me>
In reply to#75988
On 12/10/2025 11:28, Jim Jackson wrote:
> On 2025-10-12, c186282 <c186282@nnada.net> wrote:
>> On 10/11/25 18:39, Nuno Silva wrote:
>>> On 2025-10-11, apapmurray wrote:
>>>
>>>> On 04/10/2025 07:18, c186282 wrote:
>>>>> Easy enough to find what's mounted at the moment, but
>>>>> you need 'lsblk' to find what CAN possibly be mounted.
>>>>>
>>>>> Where/how does 'lsblk' get its info ???
>>>>>
>>>> I can't imagine asking a question like this on Usenet instead of just
>>>> using a search engine.
>>>
>>> Especially in this age where at least some search engines keep getting
>>> shittier?
>>
>>
>>     Gotta get past the damned ads first ...
> 
> Ads, what ads? Ublockorigin seems to do a good job, the few times I
> resort to using google, or youtube.
> 
I have to say that I have been using adblockers since forever and I 
never ever see most ads.

-- 
“Those who can make you believe absurdities, can make you commit 
atrocities.”

― Voltaire, Questions sur les Miracles à M. Claparede, Professeur de 
Théologie à Genève, par un Proposant: Ou Extrait de Diverses Lettres de 
M. de Voltaire

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#76012

Fromrbowman <bowman@montana.com>
Date2025-10-12 18:52 +0000
Message-ID<ml2bmiFqcs2U4@mid.individual.net>
In reply to#75999
On Sun, 12 Oct 2025 12:20:28 +0100, The Natural Philosopher wrote:

> On 12/10/2025 11:28, Jim Jackson wrote:
>> On 2025-10-12, c186282 <c186282@nnada.net> wrote:
>>> On 10/11/25 18:39, Nuno Silva wrote:
>>>> On 2025-10-11, apapmurray wrote:
>>>>
>>>>> On 04/10/2025 07:18, c186282 wrote:
>>>>>> Easy enough to find what's mounted at the moment, but you need
>>>>>> 'lsblk' to find what CAN possibly be mounted.
>>>>>>
>>>>>> Where/how does 'lsblk' get its info ???
>>>>>>
>>>>> I can't imagine asking a question like this on Usenet instead of
>>>>> just using a search engine.
>>>>
>>>> Especially in this age where at least some search engines keep
>>>> getting shittier?
>>>
>>>
>>>     Gotta get past the damned ads first ...
>> 
>> Ads, what ads? Ublockorigin seems to do a good job, the few times I
>> resort to using google, or youtube.
>> 
> I have to say that I have been using adblockers since forever and I
> never ever see most ads.

I use the Brave browser that has much of that built in. There is one 
annoyance that I need to find a fix for. Click on a link '34 Gerbils Go 
Wild in Valdosta' and you're brought to a news site with a text story. 
However above the text there is a video with some blow-dried moron 
babbling on. Kill that, scroll down, and a thumbnail popup of the same 
idiot appears with the same content.

lynx gets rid of the video fluff but there doesn't seem to be a 'shove 
your cookies up your ass' option.

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#75971

Fromc186282 <c186282@nnada.net>
Date2025-10-11 21:38 -0400
Message-ID<W-WcnRhsBfQdm3b1nZ2dnZfqnPhj4p2d@giganews.com>
In reply to#75943
On 10/11/25 09:09, apapmurray wrote:
> On 04/10/2025 07:18, c186282 wrote:
>> Easy enough to find what's mounted at the moment, but
>> you need 'lsblk' to find what CAN possibly be mounted.
>>
>> Where/how does 'lsblk' get its info ???
>>
> I can't imagine asking a question like this on Usenet instead of just 
> using a search engine.

   Well, I did ... and got a good clear prompt answer.

   What's YOUR attitude problem ?

   BTW there's no good response when searching
   for "Where does lsblk get its information".
   Basically you just get 50 copies of the man
   page ......

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#75984

FromAndy Burns <usenet@andyburns.uk>
Date2025-10-12 08:25 +0100
Message-ID<ml13g1FkdtuU1@mid.individual.net>
In reply to#75971
c186282 wrote:

>    BTW there's no good response when searching
>    for "Where does lsblk get its information".
>    Basically you just get 50 copies of the man
>    page ......

The man pages *do* know the answer ...

<https://man7.org/linux/man-pages/man8/lsblk.8.html#:~:text=The%20lsblk%20command%20reads%20the,types%20from%20the%20block%20device.>

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#76030

Fromc186282 <c186282@nnada.net>
Date2025-10-13 03:20 -0400
Message-ID<pY-dnaDGLdyjNXH1nZ2dnZfqn_GdnZ2d@giganews.com>
In reply to#75984
On 10/12/25 03:25, Andy Burns wrote:
> c186282 wrote:
> 
>>    BTW there's no good response when searching
>>    for "Where does lsblk get its information".
>>    Basically you just get 50 copies of the man
>>    page ......
> 
> The man pages *do* know the answer ...
> 
> <https://man7.org/linux/man-pages/man8/ 
> lsblk.8.html#:~:text=The%20lsblk%20command%20reads%20the,types%20from%20the%20block%20device.>

   Um ... no ... actually.

   They tell you how to USE lsblk, but not
   where/how it gets its info.

   A day after I posted my question some very
   useful/practical guy made it clear. Alas
   lots of parsing required.

   IMHO ... modern Linux SHOULD keep a much
   more processed/accessible file for this
   kind of stuff. People NEED it, so why
   should it be so complicated ???

   Yea, yea ... I can, mostly have, built a
   Python script to parse/find/consolidate
   the required info. But it shouldn't be
   that hard.

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#76032

FromAndy Burns <usenet@andyburns.uk>
Date2025-10-13 08:33 +0100
Message-ID<ml3o9rF3js4U1@mid.individual.net>
In reply to#76030
c186282 wrote:

> Andy Burns wrote:
> >> c186282 wrote:
>>
>>>    BTW there's no good response when searching
>>>    for "Where does lsblk get its information".
>>>    Basically you just get 50 copies of the man
>>>    page ......
>>
>> The man pages *do* know the answer ...
>>
>> <https://man7.org/linux/man-pages/man8/lsblk.8.html#:~:text=The%20lsblk%20command%20reads%20the,types%20from%20the%20block%20device.>
> 
>    Um ... no ... actually.

Did you read the link?  Did you notice the highlighted fragment?

>    They tell you how to USE lsblk, but not
>    where/how it gets its info.

"The lsblk command reads the sysfs filesystem and udev db to gather 
information. If the udev db is not available or lsblk is compiled 
without udev support, then it tries to read LABELs, UUIDs and filesystem 
types from the block device."

Is that not your answer?

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#76034

Fromc186282 <c186282@nnada.net>
Date2025-10-13 03:51 -0400
Message-ID<pY-dnaPGLdz1MnH1nZ2dnZfqn_GdnZ2d@giganews.com>
In reply to#76032
On 10/13/25 03:33, Andy Burns wrote:
> c186282 wrote:
> 
>> Andy Burns wrote:
>> >> c186282 wrote:
>>>
>>>>    BTW there's no good response when searching
>>>>    for "Where does lsblk get its information".
>>>>    Basically you just get 50 copies of the man
>>>>    page ......
>>>
>>> The man pages *do* know the answer ...
>>>
>>> <https://man7.org/linux/man-pages/man8/ 
>>> lsblk.8.html#:~:text=The%20lsblk%20command%20reads%20the,types%20from%20the%20block%20device.>
>>
>>    Um ... no ... actually.
> 
> Did you read the link?  Did you notice the highlighted fragment?


   Not NEARLY detailed enough.

   Man pages are mostly for how to use
   the particular app - NOT how they
   work in fine detail.

   From info I got, here, I now can see
   where it gets its info - lots of
   parsing required.

   However for MY future apps I can likely
   just use a LITTLE of that. EZ.


>>    They tell you how to USE lsblk, but not
>>    where/how it gets its info.
> 
> "The lsblk command reads the sysfs filesystem and udev db to gather 
> information. If the udev db is not available or lsblk is compiled 
> without udev support, then it tries to read LABELs, UUIDs and filesystem 
> types from the block device."
> 
> Is that not your answer?

   Ummm ... not mine. I was only asking
   a question.

   I do have my answer now - thanks to a
   straight-practical poster not keen on
   being superior/insulting.

   Maybe, a decade ago, I'd have "just known",
   but lots of water under the bridge now.
   TOO much to try and remember.

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