hi,
I don't have much to write about at this moment other than a screenshot shows Andriod emulator accessing gmail in it :)
Friday, February 19, 2010
Andriod my first hand xprience...
hi,
I don't have much to write about at this moment other than a screenshot shows Andriod emulator accessing gmail in it :)
Monday, January 11, 2010
Bootchart - Boot Process Performance Visualization
Bootchart is a tool for performance analysis and visualization of the GNU/Linux boot process. Resource Utilization and process information are collected during the boot process and are later rendered in a PNG, SVG or EPS encoded chart.
i, Installation in the Fedora core could be done using yum package manager.
ii, GRUB entry
The boot logger bootchartd will be in the path /sbin need to be started by the kernel instead of init script. This can be achieved by modifying the GURB or LILO kernel command line.
Note: Login as a root, open the /boot/grub/menu.lst with a text editor and add init=/sbin/bootchartd to kernel command line as shown below. Once you are done with that save the /boot/grub/menu.lst and reboot your Linux box.
iii, Visualizing the Boot log with the Bootchart
Once the Linux box is up, the Bootchart is ready with log information which is logged in /var/log/bootchart.tgz. Now its time to visualize the Bootchart. Execute the following command as a root user.
The above command would generate image file named as bootchart.svgz in the current working directory. The default image format is svg if you like to generate the boot chart as png file then you need to specify the switch -f with the image format.
i, Installation in the Fedora core could be done using yum package manager.
# yum install bootchart
ii, GRUB entry
The boot logger bootchartd will be in the path /sbin need to be started by the kernel instead of init script. This can be achieved by modifying the GURB or LILO kernel command line.
Note: Login as a root, open the /boot/grub/menu.lst with a text editor and add init=/sbin/bootchartd to kernel command line as shown below. Once you are done with that save the /boot/grub/menu.lst and reboot your Linux box.
title Fedora (2.6.29.4-167.fc11.i686.PAE)
root (hd0,1)
kernel /vmlinuz-2.6.29.4-167.fc11.i686.PAE ro root=/dev/mapper/VolGroup-LogVol01 rhgb quiet init=/sbin/bootchartd
initrd /initrd-2.6.29.4-167.fc11.i686.PAE.img
iii, Visualizing the Boot log with the Bootchart
Once the Linux box is up, the Bootchart is ready with log information which is logged in /var/log/bootchart.tgz. Now its time to visualize the Bootchart. Execute the following command as a root user.
# bootchart /var/log/bootchart.tgz
The above command would generate image file named as bootchart.svgz in the current working directory. The default image format is svg if you like to generate the boot chart as png file then you need to specify the switch -f with the image format.
# bootchart -f png /var/log/bootchart.tgz
Wednesday, December 9, 2009
Recover root password under linux with single user mode
It happens sometime that you can't remember root password. On Linux, recovering root password can be done by booting Linux under a specific mode: single user mode.
This tutorial will show how to boot Linux in single user mode when using GRUB and finally how to change root password.
During normal usage, a Linux OS runs under runlevels between 2 and 5 which corresponds to various multi-user modes. Booting Linux under runlevel 1 will allow one to enter into a specific mode, single user mode. Under such a level, you directly get a root prompt. From there, changing root password is a piece of cake.
1. Entering runlevel 1
Some Linux distribution, such as Ubuntu for instance, offer a specific boot menu entry where it is stated "Recovery Mode" or "Single-User Mode". If this is your case, selecting this menu entry will boot your machine into single user mode, you can carry on with the next part. If not, you might want to read this part.
Using GRUB, you can manually edit the proposed menu entry at boot time. To do so, when GRUB is presenting the menu list (you might need to press ESC first), follow those instructions:
* use the arrows to select the boot entry you want to modify.
* press e to edit the entry
* use the arrows to go to kernel line
* press e to edit this entry
* at the end of the line add the word single
* press ESC to go back to the parent menu
* press b to boot this kernel
The kernel should be booting as usual (except for the graphical splash screen you might be used to), and you will finally get a root prompt (sh#).
Here we are, we have gained root access to the filesystem, let's finally change the password.
2. Changing root password
As root, changing password does not ask for your old password, therefore running the command:
# passwd
will prompt you for your new password and will ask you to confirm it to make sure there is no typo.
That's it, you can now reboot your box and gain root access again
Caution: Please don't try this unless you need it.
Happy Linux...
This tutorial will show how to boot Linux in single user mode when using GRUB and finally how to change root password.
During normal usage, a Linux OS runs under runlevels between 2 and 5 which corresponds to various multi-user modes. Booting Linux under runlevel 1 will allow one to enter into a specific mode, single user mode. Under such a level, you directly get a root prompt. From there, changing root password is a piece of cake.
1. Entering runlevel 1
Some Linux distribution, such as Ubuntu for instance, offer a specific boot menu entry where it is stated "Recovery Mode" or "Single-User Mode". If this is your case, selecting this menu entry will boot your machine into single user mode, you can carry on with the next part. If not, you might want to read this part.
Using GRUB, you can manually edit the proposed menu entry at boot time. To do so, when GRUB is presenting the menu list (you might need to press ESC first), follow those instructions:
* use the arrows to select the boot entry you want to modify.
* press e to edit the entry
* use the arrows to go to kernel line
* press e to edit this entry
* at the end of the line add the word single
* press ESC to go back to the parent menu
* press b to boot this kernel
The kernel should be booting as usual (except for the graphical splash screen you might be used to), and you will finally get a root prompt (sh#).
Here we are, we have gained root access to the filesystem, let's finally change the password.
2. Changing root password
As root, changing password does not ask for your old password, therefore running the command:
# passwd
will prompt you for your new password and will ask you to confirm it to make sure there is no typo.
That's it, you can now reboot your box and gain root access again
Caution: Please don't try this unless you need it.
Happy Linux...
Monday, October 12, 2009
Software Freedom Day 2009
Software Freedom Day 2009
Every year the third Saturday of the September is http://softwarefreedomday.org/.
I too made participation this year as part of ILUGC, here are some of my snaps...
When I address the audience.
http://picasaweb.google.com/tshrinivasan/SoftwareFreedomDay09#5383205139800717858,
Visiting the stall
http://picasaweb.google.com/tshrinivasan/SoftwareFreedomDay09#5383207302460428402
With my friend Raja on right & Baskar on left
http://picasaweb.google.com/tshrinivasan/SoftwareFreedomDay09#5383206845270907378
Every year the third Saturday of the September is http://softwarefreedomday.org/.
I too made participation this year as part of ILUGC, here are some of my snaps...
When I address the audience.
http://picasaweb.google.com/tshrinivasan/SoftwareFreedomDay09#5383205139800717858,
Visiting the stall
http://picasaweb.google.com/tshrinivasan/SoftwareFreedomDay09#5383207302460428402
With my friend Raja on right & Baskar on left
http://picasaweb.google.com/tshrinivasan/SoftwareFreedomDay09#5383206845270907378
Empathy
Empathy is a messaging program which supports text, voice, and video chat and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
Empathy uses Telepathy for protocol support and has a user interface based on Gossip.Empathy could installed uisng yum
$su -
#yum install empathy
Once installation is over then weed need to setup user account, which is similar to exist in pidgin.
Enjoy the voice chat with pidgin...
Thursday, October 1, 2009
fun train
we all know about ls and ls -l, what about sl and sl -l.
check it out its all about fun.
To install: yum install sl
enjoy linux with fun...
chm file in Linux
my Linux box runs with FC 10 on top of it I have gnome. I have a necessity to view the chm file in gnome. when I google I found a handy tool called gnochm.
Installation is as simple as # yum install gnochm*
done...
To run it. we suppose to say, gnochm file_ebook.chm
enjoy reading your ebook.
have Fun,
Installation is as simple as # yum install gnochm*
done...
To run it. we suppose to say, gnochm file_ebook.chm
enjoy reading your ebook.
have Fun,
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