Tag: Linux

Programmatically Adding Workspaces in Gnome

If you ever need to add or remove Gnome workspaces using a command-line or a keyboard shortcut, here are the basics required to get it going. Gconf is Gnome’s configuration system. It keeps track of many of your computers settings.

The commands

You can see how many workspaces your desktop currently has using this command:

gconftool-2 --get /apps/metacity/general/num_workspaces

You can set the number of workspaces with this command:

gconftool-2 --set -t int /apps/metacity/general/num_workspaces 6

Just change the “6” to the number of workspaces you need. You can increase it to add workspaces, or decrease it to destroy workspaces. Applications in a removed workspace shift left to the first active workspace.

Making it into a command

Below is a command I wrote to easily add ore remove one workspace. Usage: workspace [-add|-remove]

#!/bin/bash

case "$1" in
"-add"    ) method="+";;
"-remove" ) method="-";;
*         ) echo "Usage: workspace [-add|-remove]"; exit $E_WRONGARGS;;
esac

gconftool-2 --set -t int /apps/metacity/general/num_workspaces $((`gconftool-2 --get /apps/metacity/general/num_workspaces`${method}1));

You can now use it on the command line and/or make a keyboard shortcut to call the script.

I tested this in Ubuntu 10.10, but it should work in any Linux distribution using a recent version of Gnome.

Resetting the All Inboxes counter on your Palm Pre

I’ve been digging around on webOS for a little while, learning how it ticks. I get pretty excited about the possibilities of open source mobile development. Although I haven’t created any official apps yet, I’ve learned some pretty cool stuff.

A few weeks after I got my Palm Pre my All Inboxes mailbox counter got out of sync. If I had any unread mail it would show +5 more than what I had. I think this occurred when I removed an account or had a crash or something. I’ve forgotten the details. Anyway, it was bugging the hell out of me. So today I decided to track it down. To my surprise it wasn’t too hard to figure out. Read more »

VirtualBox: Disable time sync between host and client

If you run VirtualBox you may eventually run into problems with the time or time sync within your VM guest. You can run this command on the host to disable time sync:

vboxmanage setextradata <vmname> “VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled” “1”

Just replace <vmname> with the name of your guest. On Windows hosts, you’ll need to change the command to “VBoxManage”.

You will most likely want to set the client to sync with a time server after this. On Windows clients, just double click on the time and go to the Internet Time tab. Check the box and choose time.nist.gov (better reliability).

I needed to solve this because QuickBooks Pro 2000 complains about the system time being changed continuously while in multi-user mode.

I found this simple VirtualBox time sync tip in a post titled Synchronize a Virtualized Domain Controller with External Time Servers.

Synergy keyboard shortcuts on Ubuntu

In a previous post, I wrote about running Synergy on boot in Ubuntu. Synergy also lets you setup keyboard shortcuts for various actions. Below I show how to setup Synergy keyboard shortcuts for switching between computers. Now you can work away without the need to grab the mouse to get from one screen to the next.

  1. Open a terminal and enter
    sudo gedit /etc/synergy.conf
  2. Add an options section with keystroke lines something like this
    section: options
    keystroke(Alt+1) = switchToScreen(comp1)
    keystroke(Alt+2) = switchToScreen(comp2)
    end
    
  3. Save the file and exit
  4. Restart Synergy (reboot if you don’t know how to restart otherwise)

You will need to replace “comp1” and “comp2” with your computer names or aliases. These should be listed in the screens section of your synergy.conf. And of course, if you have more than 2 screens, just add more keystroke lines.

You can learn more about Synergy’s options on the Synergy configuration page.

Synergy on boot in Ubuntu

Synergy is a great tool that lets you control multiple computers with one keyboard and mouse. If you use Ubuntu, or another linux distro, it may not be entirely obvious how to get synergy to run on boot. Below are the steps I took:

Update July 3, 2010 – I added client installation instructions and headings that hopefully will clarify a few points.

For an Ubuntu Server:

  1. Install Synergy if you haven’t already
    • Frontend applications like QuickSynergy will install Synergy for you
    • Otherwise, you can go to System > Administration > Synaptic Package Manager, and search for “synergy”
  2. Create your synergy config file
  3. Store the synergy config in /etc/synergy.conf
    • From a terminal type sudo gedit /etc/synergy.conf
  4. Set synergy to run on boot
    • Go to System > Preferences > Startup Applications
    • Add Synergy, entering /usr/bin/synergys (note the s on the end) for the command
    • Reboot to test it out

For an Ubuntu client

  1. Install Synergy if you haven’t already (as in step 1 above)
  2. Make sure the Synergy server is up and running. You can ping it’s hostname or ip address
  3. Set synergy to run on boot
    • Go to System > Preferences > Startup Applications
    • Add Synergy, entering /usr/bin/synergyc <server>
      • note the c on the end of the command
      • <server> is the hostname or IP address you were able to ping in step 2
    • Reboot to test it out

I’m sure there are many other ways to accomplish this. If you are interested in learning more about Synergy, the Synergy-plus project maintains an excellent list of Synergy Related Projects.