Public bug reported:

Running update-grub gives the error:

    grep: input file '/tmp/grub.cfg.new' is also the output

This problem is caused by a combination of...

    250   exec > ${grub_cfg}.new

and ...

    285 if [ "x${grub_cfg}" != "x" ] && ! grep -q "^password "
${grub_cfg}.new ; then

effectively resulting in:

grep -q "^password" /tmp/grub.cfg.new > /tmp/grub.cfg.new

Problem is in patch debian/patches/grub.cfg_400.patch.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: grub2 (not installed)
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic-pae 3.2.6
Uname: Linux 3.2.0-16-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.91-0ubuntu1
Architecture: i386
Date: Fri Feb 17 15:17:54 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: Upgraded to precise on 2012-01-12 (36 days ago)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 precise

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https://bugs.launchpad.net/bugs/934269

Title:
  grub-mkconfig (running as update-grub) gives scary message "grep:
  input file '/tmp/grub.cfg.new' is also the output"

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