[Bug 2152822] Re: comm and sort are incompatible in 26.04 LTS

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: rust-coreutils (Ubuntu)
       Status: New => Confirmed

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Title:
  comm and sort are incompatible in 26.04 LTS

Status in rust-coreutils package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from 25.10 to 26.04, I've noticed one of my scripts
  fail. It sorted some files with `sort` and then compared them with
  `comm`, and now it fails with messages like `comm: input is not in
  sorted order`.

  Turns out the current version of `sort` supports locale-based
  collation, so it have sorted the files correctly according to my
  `LC_COLLATE=en_US.UTF-8` locale; while `comm` doesn't support
  collation, and requires files sorted in `C` locale.

  As most Ubuntu systems have locales other than `C`, this makes `sort`
  and `comm` incompatible under default conditions.

  Example: prepare two `en_US`-sorted files and compare them:

  $ cat en_US_1.txt
  aa
  Aa
  ab
  Ab

  $ cat en_US_2.txt
  bb
  Bb
  bc
  Bc

  $ LC_COLLATE=en_US.UTF-8 comm -12 en_US_1.txt en_US_2.txt
  comm: file 1 is not in sorted order
  comm: file 2 is not in sorted order
  comm: input is not in sorted order

  Github issue: https://github.com/uutils/coreutils/issues/12253
  A similar issue was mentioned in bug 2117711

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