Regenerate TS3 priv key

If you need to regenerate the ts3 priv key you can start the server with a temp admin key using

ts3server_minimal.sh serveradmin_password=YourNewPassWord
(http://shawnhyde.com/post/2010/01/12/How-to-recover-serveradmin-access-of-teamspeak3ts3-server-after-system-reload)

Login with:
login serveradmin password

Then generate key with:
use 1 tokenadd tokentype=0 tokenid1=6 tokenid2=0

(https://freevps.us/thread-11350.html)

Remove unused kernels and headers from ubuntu server

Yet again I found my system clogged up with unused kernels and headers. This time I am making a note of the one-liner to remove the unused junk.

(Found at http://tuxtweaks.com/2010/10/remove-old-kernels-in-ubuntu-with-one-command/)

You can first check that the correct packages are selected to remove with;

 dpkg -l linux-* | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e [0-9] | xargs sudo apt-get --dry-run remove 

and if you are happy remove those with this;

dpkg -l linux-* | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e [0-9] | xargs sudo apt-get -y purge

A word of warning, if you have installed a new kernel recently ensure you have rebooted since, and secondly ensure that your current kernel is not on the list of packages to remove of you will end up with a un-bootable system.

Combining multiple video files with mencoder

The following command can be used to combine several files into a single file,

mencoder -idx -oac copy -ovc copy -o output.avi input1.avi input2.avi 

Caveats:

• Files must be the same resolution
• Files must be encoded with the same codec (although different containers are ok)

Google search from keyboard shortcut

Plan

I want to be able to run a google search based on text contained on the clipboard, this allows me to quickly search for text snippits I come across

Windows 

From this site: 

http://blogs.technet.com/b/heyscriptingguy/archive/2004/12/15/how-can-i-grab-a-url-from-the-clipboard-and-then-open-that-web-site-in-a-browser.aspx

I found a snippet of VBS script got me most of the way, the only thing to add is to adapt it so that it appends the string to the end of a google seach URL. 

The final script looks like this 

Set objIE = CreateObject("InternetExplorer.Application")
objIE.Navigate("about:blank")
strURL = objIE.document.parentwindow.clipboardData.GetData("text")
objIE.Quit

Set objShell = CreateObject("Wscript.Shell")
strSearchURL = "http://www.google.co.uk/search?q=" & strURL
objShell.Run(strSearchURL)

You can then save this script with a vbs file extension and have it called when you press a certain keyboard shortcut or macro key.

By default this will prompt to allow the script to access the clipboard. You need to add "about:blank" to the trusted internet zone and set the "Programmatic clipboard access" to enabled not prompt. 

Ubuntu

After looking into google searching from gnome-terminal the only solution looked a bit risky http://blog.ubuntu-tweak.com/2010/11/16/gnome-terminal-with-google-search-support.html

As a result I decided to look into a safer and more general option, that was using xsel and ubuntu keyboard shortcuts to open a browser tab searching for whatever is selected.

#!/bin/bash    # Steve Fry http://cdtfry.blogger.com
 # 04/Oct/2012
 
 # Search based on selected text
 search_string="http://www.google.com/search?q=$(xsel)"
 
 # Search based on clipboard contents
 # search_string="http://www.google.com/search?q=$(xsel --clipboard )"  
 
 # Open a chromium tab based on the search string.
 chromium-browser "$search_string"  

This can then be saved to a text file such as /home/steve/bin/google_from_clipboard.sh and then allocated to a keyboard shortcut using the ubuntu keyboard menu.


Steve

Specifying IP range for tcpdump

I recently came across the need to specify a IP range for tcpdump (setting up an install of darkstat to monitor network usage by host - but ignoring traffic within my local network).

However the only solution I could find in pcap-filter syntax was to specify blocks of ip's by netmask.

After looking into filtering ip addressea by inspecting the packets themselves, (http://isc.sans.edu/diary.html?storyid=6667) I finally came across a comment on the bottom of the previous link which suggested using a script cidr_range.pl (http://archives.neohapsis.com/archives/postfix/2005-06/att-1279/cidr_range__charset_iso-8859-15) which translated ip ranges into a series of ip/cidr netmasks that can them be used to filter tcpdump (or in my case darkstat).

Therefore

steve@dell-laptop:~$ perl cidr_range.pl 192.168.0.100 192.168.0.200
192.168.0.100/30
192.168.0.104/29
192.168.0.112/28
192.168.0.128/26
192.168.0.192/29
192.168.0.200/32

can then be translated to

not (net 192.168.0.100/30 or net 192.168.0.104/29 or net 192.168.0.112/28 or net 192.168.0.128/26 or net 192.168.0.192/29 or net 192.168.0.200/32)

which then filters out all traffic to or from hosts within the range 192.168.0.100-200.

Steve

Refs:
http://archives.neohapsis.com/archives/postfix/2005-06/att-1279/cidr_range__charset_iso-8859-15
http://isc.sans.edu/diary.html?storyid=6667
http://www.manpagez.com/man/7/pcap-filter/
http://www.tcpdump.org/tcpdump_man.html