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From: Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups: comp.unix.shell
Subject: Re: Sorting problem with Unix sort(1) with UTF-8 punctuation
 characters - locale issue
Date: Thu, 20 Feb 2025 06:37:01 +0100
Organization: A noiseless patient Spider
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On 19.02.2025 21:22, Christian Weisgerber wrote:
> 
> My working hypothesis would be that setting LC_TIME to a nonexistent
> locale causes an error that invalidates the _whole_ locale setting
> and causes a fallback to a default setting, likely the "C" locale.

One thing I've forgotten to mention here; if an unknown locale is used
I get an error "...: unknown locale". But it seems to be sufficient if
the first part (e.g. "de_DE") is existing to not create a diagnostic.
Suffixes as in "de_DE.xyz" are not notified as errors. So, yes, some
fall-back/default must be in place since the commands are executed
anyway, even with a notified wrong locale. I'd expect that "de_DE.xyz"
would fall back to "de_DE", but that is speculation. (A peek into the
'strace' differences didn't really enlighten me.[*])

Janis

[*] For  LC_ALL=de_DE.xyz@abc  for example:

open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
open("/usr/lib/locale/de_DE.xyz@abc/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/de_DE@abc/LC_IDENTIFICATION", O_RDONLY|O_CLOEXEC)
= -1 ENOENT (No such file or directory)
open("/usr/lib/locale/de.xyz@abc/LC_IDENTIFICATION", O_RDONLY|O_CLOEXEC)
= -1 ENOENT (No such file or directory)
open("/usr/lib/locale/de@abc/LC_IDENTIFICATION", O_RDONLY|O_CLOEXEC) =
-1 ENOENT (No such file or directory)
open("/usr/lib/locale/de_DE.xyz/LC_IDENTIFICATION", O_RDONLY|O_CLOEXEC)
= -1 ENOENT (No such file or directory)
open("/usr/lib/locale/de_DE/LC_IDENTIFICATION", O_RDONLY|O_CLOEXEC) = -1
ENOENT (No such file or directory)
open("/usr/lib/locale/de.xyz/LC_IDENTIFICATION", O_RDONLY|O_CLOEXEC) =
-1 ENOENT (No such file or directory)
open("/usr/lib/locale/de/LC_IDENTIFICATION", O_RDONLY|O_CLOEXEC) = -1
ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de_DE.xyz@abc/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de_DE@abc/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de.xyz@abc/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de@abc/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de_DE.xyz/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de_DE/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de.xyz/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/de/LC_IDENTIFICATION",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)