du has --summarise option in en_GB locale, which doesn't work

[NeilGreenwood]

$ du --summari<Tab>
--summarise --summarize
$ du --summarise
du: unrecognised option '--summarise'
Try 'du --help' for more information.
$ locale
LANG=en_GB.UTF-8
LANGUAGE=en_GB:en
LC_CTYPE="en_GB.UTF-8"
LC_NUMERIC=en_GB.UTF-8
LC_TIME=en_GB.UTF-8
LC_COLLATE="en_GB.UTF-8"
LC_MONETARY=en_GB.UTF-8
LC_MESSAGES="en_GB.UTF-8"
LC_PAPER=en_GB.UTF-8
LC_NAME=en_GB.UTF-8
LC_ADDRESS=en_GB.UTF-8
LC_TELEPHONE=en_GB.UTF-8
LC_MEASUREMENT=en_GB.UTF-8
LC_IDENTIFICATION=en_GB.UTF-8
LC_ALL=

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: coreutils 8.20-3ubuntu5
ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
Uname: Linux 3.8.0-27-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Wed Aug 28 08:12:42 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-04-27 (487 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
MarkForUpload: True
SourcePackage: coreutils
UpgradeStatus: Upgraded to raring on 2013-04-26 (123 days ago)

[C de-Avillez (hggdh2)]

Thank you for opening this bug and helping make Ubuntu better.

This is not a 'du' bug: completion of command options is dealt with by 'bash-completion'. I reassigned the bug to it.

You can verify this is indeed what is going on by running 'set -x' just before trying 'du --summ<TAB>'.

[Adam Smith (adam-disc0tech)]

Cannot reproduce with same locale in trusty. Tab completion does not offer "summarise" option.