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As Stéphane Chazelas said in the comment, it is a bug in the specific implementation of coreutils (in coreutils-8.22-11.el7) by CentOS/Red Hat, more specifically in the buggy internationalisation patch (coreutils-i18n.patch) they wrote and applied on top of GNU's coreutils-8.22.

I reported it here to CentOS and also here to Red Hat. It was already known at Red Hat and fixed there in coreutils-8.22-13.el7.

That one is not available yet for CentOS at this time (2015-08-20).

For completeness, note that the bug was also (incorrectly as the bug was not there) reported upstreams (at GNU's) where you'll find some more information about it.

As Stéphane Chazelas said in the comment, it is a bug in the specific implementation of coreutils (in coreutils-8.22-11.el7) by CentOS/Red Hat, more specifically in the buggy internationalisation patch (coreutils-i18n.patch) they wrote and applied on top of GNU's coreutils-8.22.

I reported it here to CentOS and also here to Red Hat. It was already known at Red Hat and fixed there in coreutils-8.22-13.el7.

That one is not available yet for CentOS at this time (2015-08-20).

For completeness, note that the bug was also (incorrectly as the bug was not there) reported upstreams (at GNU's) where you'll find some more information about it.

As Stéphane Chazelas said in the comment, it is a bug in the specific implementation of coreutils (in coreutils-8.22-11.el7) by CentOS/Red Hat, more specifically in the buggy internationalisation patch they wrote and applied on top of GNU's coreutils-8.22.

I reported it here to CentOS and also here to Red Hat. It was already known at Red Hat and fixed there in coreutils-8.22-13.el7.

That one is not available yet for CentOS at this time (2015-08-20).

As Stéphane Chazelas said in the comment, it is a bug in the specific implementation of coreutils (in coreutils-8.22-11.el7) by CentOS/Red Hat, more specifically in the buggy internationalisation patch (coreutils-i18n.patch) they wrote and applied on top of GNU's coreutils-8.22.

I reported it here to CentOS and also here to Red Hat. It was already known at Red Hat and fixed there in coreutils-8.22-13.el7.

That one is not available yet for CentOS at this time (2015-08-20).

For completeness, note that the bug was also (incorrectly as the bug was not there) reported upstreams (at GNU's) where you'll find some more information about it.

As Stéphane Chazelas said it the comment it is a bug. I reported it here to CentOS and also here to Red Hat. It was already known at Red Hat.

As Stéphane Chazelas said in the comment, it is a bug in the specific implementation of coreutils (in coreutils-8.22-11.el7) by CentOS/Red Hat, more specifically in the buggy internationalisation patch they wrote and applied on top of GNU's coreutils-8.22. 

I reported it here to CentOS and also here to Red Hat. It was already known at Red Hat and fixed there in coreutils-8.22-13.el7.

That one is not available yet for CentOS at this time (2015-08-20).