From: vallor@vallor.earth
At Mon, 6 Oct 2025 10:02:20 -0000 (UTC), Dan Purgert
wrote:
> On 2025-10-06, RobH wrote:
> > On 06/10/2025 01:11, Alan K. wrote:
> >> On 10/5/25 7:36 PM, vallor wrote:
> >>> Good advice.
> >>>
> >>> There's also the -S option to du, which totals up
> >>> usage in directories. So:
> >>>
> >>> sudo du -Sx / > /tmp/d.sizes
> >>>
> >>> Then:
> >>>
> >>> sort -rn /tmp/d.sizes > /tmp/sorted.d.sizes
> >>>
> >>> head /tmp/sorted.d.sizes
> >>>
> >>> The "-x" in "du -Sx" means to stay on the same filesystem,
> >>> so if /home is separate, you'll need to repeat the process
> >>> there.
> >>
> >> Simplified without creating the file:
> >> sudo du -Sx / | sort -rn | head -20
> >>
> > Pardon me fore asking, but what do the 6 and 7 figure numbers mean
> > on the left hand side when it lists the folders etc.
>
> It's the file-size. I *believe* it is in blocks on your drive; so the
> numbering will be dependent on your filesystem (e.g. here I have 4K
> blocks, so a 13K file shows as "4"; but if you have 512B blocks, it
> would be 26).
From the man page:
Display values are in units of the first available SIZE from
--block-size, and the DU_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE
environment variables. Otherwise, units default to 1024
bytes (or 512 if POSIXLY_CORRECT is set).
So basically, it's in Kbytes, as in units of 1024 bytes.
(Sidenote: I can never remember if that's supposed to be
"POSIXLY_CORRECT" or "POSIX_CORRECTLY".)
--
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"Bugs are Sons of Glitches!"
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