[Bug 457277] Re: grep does not print warning when recursively grepping stdin

[Ma Xiaojun]

Starting from grep 2.11, -r search the currect directory when '.' is not
given.

http://git.savannah.gnu.org/cgit/grep.git/tree/NEWS#n162

Is this good enough?

** Changed in: grep (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/457277

Title:
  grep does not print warning when recursively grepping stdin

Status in grep:
  Unknown
Status in “grep” package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: grep

  A common user error pattern is to call a recursive grep and miss off
  the trailing '.' for current directory. This causes grep to wait
  indefinitely for stdin, but users will presume it is just taking a
  long time to search and will leave it running

  $ grep -r PATTERN
  ...
  ...
  ...<indefinite pause>

  This is on Ubuntu karmic running the latest GNU grep 2.5.4

  Contrastingly, on a Apple Mac running OS X and grep (GNU grep) 2.5.1 a
  helpful warning is printed in this case which immediately guides the
  user to their mistake

  $ grep -r PATTERN
  grep: warning: recursive search of stdin

  I presume this is a custom patch that has been applied to the grep
  binary that ships with OSX (rather than a warning message that has
  been purposefully removed), therefore I suggest this warning message
  is added to the default code base.

  ProblemType: Bug
  Architecture: i386
  Date: Wed Oct 21 15:49:26 2009
  DistroRelease: Ubuntu 9.10
  Package: grep 2.5.4-4
  ProcEnviron:
   SHELL=/bin/bash
   PATH=(custom, user)
   LANG=en_GB.UTF-8
  ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
  SourcePackage: grep
  Uname: Linux 2.6.31-14-generic i686

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