[Bug 1045072] Re: bash generates spurious DEL on empty variable interpolation

[Ian! D. Allen]

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to bash in Ubuntu.
https://bugs.launchpad.net/bugs/1045072

Title:
  bash generates spurious DEL on empty variable interpolation

Status in “bash” package in Ubuntu:
  New

Bug description:
  #!/bin/bash -u
  # BASH BUG: spurious DEL characters appear on empty variable interpolation.
  # BASH 4.2.8(1)-release
  # Script works fine (expected output) using /bin/dash.
  # -Ian! D. Allen - idallen at idallen.ca - www.idallen.com

  a=''

  {
  echo correct "$a"               # correct empty output line
  echo correct "$a""$a"           # correct empty output line
  echo correct "$a""$a""$a"       # correct empty output line
  echo XwrongX "$a""$a""$a""$a"   # spurious two DEL chars appear at line end
  echo correct a"$a"              # correct single "a" on line
  echo XwrongX a"$a""$a"          # spurious DEL char appears at line end
  echo correct a"$a$a"            # correct single "a" on line
  echo correct a"$a$a$a$a"        # correct single "a" on line
  } | cat -v

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: bash 4.2-0ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-15.66-generic 2.6.38.8
  Uname: Linux 2.6.38-15-generic x86_64
  Architecture: amd64
  Date: Sun Sep  2 15:36:55 2012
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  SourcePackage: bash
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1045072/+subscriptions