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bug#47023: df utilility displays G instead of GM as unit size for Gigaby
From: |
Pádraig Brady |
Subject: |
bug#47023: df utilility displays G instead of GM as unit size for Gigabytes in power of 1000 |
Date: |
Tue, 9 Mar 2021 19:51:45 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:84.0) Gecko/20100101 Thunderbird/84.0 |
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On 09/03/2021 12:58, Philippe Bénézech via GNU coreutils Bug Reports wrote:
Dear maintener,
I found a reproducible bug in df utility, installed in debian stable
$ df --version |head -1
df (GNU coreutils) 8.30
$ cat /etc/debian_version
10.8
df displays G instead of GM as unit size for Gigabytes in power of 1000
(but the value is correct)
This is not restricted to G
$ df -BGB /home
Sys. de fichiers blocs de 1GB Utilisé Disponible Uti% Monté sur
/dev/mapper/ssd2 421GB 355GB 45GB 89% /home
$ df -H /home
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
/dev/mapper/ssd2 421G 355G 45G 89% /home
In summary df -H is outputting with a concise single letter,
which is indistinguishable from that of df -h.
I agree that's not ideal as the output can't be
interpreted without the command as context.
I.e. it restricts usage to direct command line usage.
A possible change we could make here would be to use GB, MB etc.
if --si is specified.
But also -h and -H are not really useful outside of direct cli usage,
I'm 50:50 on changing this.
This was originally discussed at https://bugs.gnu.org/18119
Mentioned there is an option to use the new numfmt functionality
to provide more control and unambiguous output.
BTW the fact that a B suffix implies SI units is awkward in the first place,
which I've documented the reasons for at:
https://www.pixelbeat.org/docs/coreutils-gotchas.html#units
cheers,
Pádraig