[Bug 880120] Re: read -r does not protect backslashes

[Ian! D. Allen]

*** This bug is a duplicate of bug 259671 ***
    https://bugs.launchpad.net/bugs/259671

Thanks Jilles - you are absolutely right.  I had forgotten about versions of echo that process backslashes.
I see that one cannot turn off the backslash processing of the dash echo, which is why you need the printf.
Thanks!

** Description changed:

+ Edit: This isn't a bug in "read" - it's the way dash's "echo" handles
+ backslashes.
+ 
  Both natty and oneiric dash fail to protect backslashes when using "read
  -r".
  
  natty:   dash 0.5.5.1-7.2ubuntu1
  oneiric: dash 0.5.5.1-7.4ubuntu1
  
  Example bug:
  
-     $ echo '000\n999' | dash -c ' read -r f ; echo "$f" '
-     000
-     999
+     $ echo '000\n999' | dash -c ' read -r f ; echo "$f" '
+     000
+     999
  
  Other shells do it correctly:
  
-     $ echo '000\n999' | bash -c ' read -r f ; echo "$f" '
-     000\n999
+     $ echo '000\n999' | bash -c ' read -r f ; echo "$f" '
+     000\n999
  
-     $ echo '000\n999' | static-sh -c ' read -r f ; echo "$f" '
-     000\n999
+     $ echo '000\n999' | static-sh -c ' read -r f ; echo "$f" '
+     000\n999
  
  This means you can't use "read" to read arbitrary lines of text.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: dash 0.5.5.1-7.2ubuntu1
  ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
  Uname: Linux 2.6.38-12-generic x86_64
  Architecture: amd64
  Date: Sat Oct 22 18:28:32 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  SourcePackage: dash
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/880120

Title:
  read -r does not protect backslashes

Status in “dash” package in Ubuntu:
  New

Bug description:
  Edit: This isn't a bug in "read" - it's the way dash's "echo" handles
  backslashes.

  Both natty and oneiric dash fail to protect backslashes when using
  "read -r".

  natty:   dash 0.5.5.1-7.2ubuntu1
  oneiric: dash 0.5.5.1-7.4ubuntu1

  Example bug:

      $ echo '000\n999' | dash -c ' read -r f ; echo "$f" '
      000
      999

  Other shells do it correctly:

      $ echo '000\n999' | bash -c ' read -r f ; echo "$f" '
      000\n999

      $ echo '000\n999' | static-sh -c ' read -r f ; echo "$f" '
      000\n999

  This means you can't use "read" to read arbitrary lines of text.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: dash 0.5.5.1-7.2ubuntu1
  ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
  Uname: Linux 2.6.38-12-generic x86_64
  Architecture: amd64
  Date: Sat Oct 22 18:28:32 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  SourcePackage: dash
  UpgradeStatus: No upgrade log present (probably fresh install)

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