[Bug 1877571] [NEW] bash is missing feature to use keyword if identically named alias exists

[Mikko Rantalainen]

Public bug reported:

If following command is run

    (sleep 1 & sleep 1 & time wait); date

bash is supposed to run two commands in parallel, wait for both to
complete and the run third command.

However, if current environment has following alias configured

    alias time='/usr/bin/time -v'

then the above command will fail with

   /usr/bin/time: cannot run wait: No such file or directory

and the final command is run without a wait.

Bash already has "command" to force interpretation as system command and
"builtin" to force interpretation as built-in command. However bash is
missing "keyword" to force interpretation as keyword.

One should be able to write

    (sleep 1 & sleep 1 & keyword time wait); date

to force time to be interpreted as bash keyword.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: bash 4.4.18-2ubuntu1.2
ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-lowlatency 5.3.18
Uname: Linux 5.3.0-51-lowlatency x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CurrentDesktop: MATE
Date: Fri May  8 15:48:23 2020
EcryptfsInUse: Yes
InstallationDate: Installed on 2019-01-05 (488 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: bash
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1877571

Title:
  bash is missing feature to use keyword if identically named alias
  exists

Status in bash package in Ubuntu:
  New

Bug description:
  If following command is run

      (sleep 1 & sleep 1 & time wait); date

  bash is supposed to run two commands in parallel, wait for both to
  complete and the run third command.

  However, if current environment has following alias configured

      alias time='/usr/bin/time -v'

  then the above command will fail with

     /usr/bin/time: cannot run wait: No such file or directory

  and the final command is run without a wait.

  Bash already has "command" to force interpretation as system command
  and "builtin" to force interpretation as built-in command. However
  bash is missing "keyword" to force interpretation as keyword.

  One should be able to write

      (sleep 1 & sleep 1 & keyword time wait); date

  to force time to be interpreted as bash keyword.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bash 4.4.18-2ubuntu1.2
  ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-lowlatency 5.3.18
  Uname: Linux 5.3.0-51-lowlatency x86_64
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri May  8 15:48:23 2020
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2019-01-05 (488 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: bash
  UpgradeStatus: No upgrade log present (probably fresh install)

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