[Bug 893271] Re: /etc/acpi/screenblank.sh shows awk syntax error

Steve Langasek steve.langasek at canonical.com
Wed Nov 23 22:57:29 UTC 2011

On Mon, Nov 21, 2011 at 08:11:33PM -0000, Brad Evans wrote:
> I found the problem in the script  ..

> /usr/share/acpi-support/power-funcs

> I think that in line 9 ..

> user=$(who | awk "/:$displaynum)/ { print \$1; exit }")

> .. should be ...

> user=$(who | awk "/:$displaynum/ { print \$1; exit }")

No, the ) is intentionally part of the match, to preclude accidentally
matching display names that have the one we're looking for as a prefix.

The problem here is gawk and mawk having two different means of interpreting
), and awk being an alternative that could point at either one.  mawk is
installed by default, but it's likely that mawk's behavior here is actually
a bug and we probably don't want to rely on it; nor do we want acpi-support
to have to depend on gawk.

So I think the proper solution is to follow up on mawk's behavior and fix
mawk if necessary.

Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org

** Changed in: acpi-support (Ubuntu)
   Importance: Undecided => Medium

** Changed in: acpi-support (Ubuntu)
       Status: New => Triaged

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  /etc/acpi/screenblank.sh shows awk syntax error

Status in “acpi-support” package in Ubuntu:

Bug description:
  When running /etc/acpi/screenblank.sh, I get ..

  awk: line 1: regular expression compile failed (missing '(')

  Screen does go blank though..

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: acpi-support 0.138
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  Date: Mon Nov 21 14:27:21 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
   PATH=(custom, user)
  SourcePackage: acpi-support
  UpgradeStatus: No upgrade log present (probably fresh install)

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