Jitsi (previously SIP Communicator) is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, AIM/ICQ, Windows Live, Yahoo!, Bonjour and many other useful features. Jitsi is Open Source / Free Software, and is available under the terms of the LGPL.
The application is developed (mostly) in Java and basd on OSGi.
http://www.jitsi.org/
How The Kernel Manages Your Memory
http://duartes.org/gustavo/blog/post/how-the-kernel-manages-your-memory
Anatomy of a Program in Memory
http://duartes.org/gustavo/blog/post/anatomy-of-a-program-in-memory
String Manipulation and Expanding Variables
For your ready references here are all your handy bash parameter substitution operators. Try them all; enhance your scripting skills like a pro:
| ${parameter:-defaultValue} | Get default shell variables value |
| ${parameter:=defaultValue} | Set default shell variables value |
| ${parameter:?"Error Message"} | Display an error message if parameter is not set |
| ${#var} | Find the length of the string |
| ${var%pattern} | Remove from shortest rear (end) pattern |
| ${var%%pattern} | Remove from longest rear (end) pattern |
| ${var:num1:num2} | Substring |
| ${var#pattern} | Remove from shortest front pattern |
| ${var##pattern} | Remove from longest front pattern |
| ${var/pattern/string} | Find and replace (only replace first occurrence) |
| ${var//pattern/string} | Find and replace all occurrences |
Explanation and details:
http://www.cyberciti.biz/tips/bash-shell-parameter-substitution-2.html
calibre is a free and open source e-book library management application developed by users of e-books for users of e-books. It has a cornucopia of features divided into the following main categories:
MobileRead: E-Book community
libimobiledevice is a software library that talks the protocols to support iPhone®, iPod Touch® and iPad® devices on Linux. Unlike other projects, it does not depend on using any existing proprietary libraries and does not require jailbreaking. It allows other software to easily access the device's filesystem, retrieve information about the device and it's internals, backup/restore the device, manage SpringBoard® icons, manage installed applications, retrieve addressbook/calendars/notes and bookmarks and synchronize music and video to the device. The library is in development since August 2007 with the goal to bring support for these devices to the Linux Desktop.
Linux has had this neat feature for quite some time now: since 2.4.19 according to the docs. Yet, it is neither very known nor very used. I couldn't even find a program that would create a new namespace for its subprocesses, similar to what chroot does with the root of the file hierarchy.
This neat feature allows each process to have a different set of mount points. While you most of the time want processes to share their mount points, there are some cases where you may want to have some processes have a different set of mount points. Combined with bind mounts, it can allow some useful setups. http://glandium.org/blog/?p=217
From http://dev.eclipse.org/blogs/eclipsewebmaster/2009/09/02/what-is-my-nfs-serve...
If you're running an NFS daemon (nfsd), at some point in time you may have wondered what it was doing right now. If it's running in kernel space, tools like lsof and strace don't work, so you're left guessing.
After much Googleing and some inspecting of the Kernel source code, I discovered some debugging values that can be poked into /proc/sys/sunrpc/nfsd_debug. The most useful was 32, which I used like this:
echo 32 > /proc/sys/sunrpc/nfsd_debug; tail -f /var/log/messages | grep lookup
Essentially, this will give you an idea as to what files are being served up by nfsd. Be careful, though: on a busy NFS server, this will spew lots of output to /var/log/messages.
After stopping the above command with CTRL+C, don't forget to turn off nfsd_debug:
echo 0 > /proc/sys/sunrpc/nfsd_debug
With this trick I was able to find some nasties that were hurting our NFS performance.
