To 64 bit or not to 64 bit.

64 bit has some advantages and disadvantages compared to 32 bit.
+ possible to address more than 4GB RAM
+ better performance with various tools
- not all applications are 64 bit available
- more RAM space used due larger pointers and data types

Well, well, lets see what it does in general usage…

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Gnome 2.30 (Ubuntu 10.04) renamed the DeviceKit.Power to UPower:

$ echo 'dbus-send --system --print-reply --dest=org.freedesktop.UPower /org/freedesktop/UPower org.freedesktop.UPower.Hibernate' | at now + 30 minutes

There’s also suspend.
Shutdown (Stop) and Reboot (Restart) works over the system call: org.freedesktop.ConsoleKit

Or use this tool

—

Pre Gnome 2.30

As of Ubuntu 9.10, the gnome-power-cmd doesn’t exist anymore..but…
D-Bus to the rescue!!

Hibernate after 30 Minutes:

$ echo 'dbus-send --system --print-reply --dest=org.freedesktop.DeviceKit.Power /org/freedesktop/DeviceKit/Power org.freedesktop.DeviceKit.Power.Hibernate' | at now + 30 minutes

There’s also suspend.
Shutdown, reboot and logout works over the session call: org.gnome.SessionManager

Or use this tool

—

Pre Ubuntu 9.10:

Suspend:

$ gnome-power-cmd suspend

Hibernate after 30 Minutes:

$ echo 'gnome-power-cmd hibernate' | at now + 30 minutes
job 1 at Mon Sep  7 15:10:00 2009

You can review and delete any queued job with:

$ atq
1	Mon Sep  7 15:10:00 2009 a wag
 
$ atrm 1

The gnome-power-cmd also accepts shutdown and reboot.

Storing sensitive data on an encrypted mobile device with Truecrypt.
Accessible on Ubuntu and Windows.

You need:

• Truecrypt 6.0a or 6.3a (may work with other version too)
• Mobile device (flash drive, ext. HDD, etc.)
• Administrative privileges
• 10 minutes

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You need:

• Pidgin (available on Ubuntu standard installation or over apt-get)
• IM-Buddy
• 5 minutes

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Ever wanted to pack your scripts into .deb packages?

Here we go…

You need:

• ‘devscripts’ package (over apt-get)
• your script(s)
• 10 minutes

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Encrypt and digitally sign your mails with GPG, Thunderbird and Enigmail on Ubuntu 8.04.

If you don’t know, what GPG is, read the introduction from the GPG mini Howto, it won’t take long.

Install Thunderbird and Enigmail, start Thunderbird and create or add an email address.

For the following operations, navigate to: OpenPGP -> Key Management

Generate a keypair with: Generate -> New Key Pair

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