Little Brain » linux

MYSQL drop all tables in database in linux

kriwil — Fri, 26 Aug 2011 03:22:12 +0000

Taken from http://knaddison.com/technology/mysql-drop-all-tables-database-using-single-command-line-command#comment-3588.

#!/bin/sh

mysql --user=$1 --password=$2 -BNe "show tables" $3 | tr 'n' ',' | sed -e 's/,$//' | awk '{print "SET FOREIGN_KEY_CHECKS = 0;DROP TABLE IF EXISTS " $1 ";SET FOREIGN_KEY_CHECKS = 1;"}' | mysql --user=$1 --password=$2 $3

Save code above in a file, say, mysql-drop-tables. Then change the permission to excecuteable

chmod +x mysql-delete-tables

Then run it

mysql-drop-tables dbuser dbpassword dbname

Here’s fhe file if you’re too lazy to copy paste
http://dl.dropbox.com/u/112837/scripts/mysql-drop-tables

Convert pdf to image

kriwil — Sun, 20 Jun 2010 15:31:36 +0000

Ever want to convert pdf file to an image? It’s easy with imagemagick. Ubuntu default installation has it. I believe it’s installed in most linux distribution by default. Anyway, here’s how:

convert file.pdf file.jpg convert file.pdf file.png

Yeah. That easy.

An Error Occurred During The Signature Verification

kriwil — Tue, 25 Nov 2008 02:55:56 +0000

If you’re using ubuntu as your choice of linux distribution, and you like to add some unofficial repositories, you probably find some warnings when you run apt-get update command.

The warnings are probably like this

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://dl.google.com stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A040830F7FAC5991

W: Failed to fetch http://dl.google.com/linux/deb/dists/stable/Release  

W: Some index files failed to download, they have been ignored, or old ones used instead.
W: You may want to run apt-get update to correct these problems

That’s the warnings I got when I added google debian repository. There won’t be anything bad about it, since we could still install the packages from that repositories. But, I we could get rid the warnings, that’s would be a lot better. We could use gpg command to get the key.

Short Version

For you who don’t want to read pointless explanations below, here’s the short version

gpg --keyserver hkp://subkeys.pgp.net --recv-keys A040830F7FAC5991
gpg --export --armor 7FAC5991 | sudo apt-key add -

Long Version

Here’s the explained step. First we have to get the key from the key server.

gpg --keyserver hkp://subkeys.pgp.net --recv-keys A040830F7FAC5991

The A040830F7FAC5991 is from the warning shown before. You might want to change it if you have different repository. For the google repository, you should get this as the output

gpg: requesting key 7FAC5991 from hkp server subkeys.pgp.net
gpg: key 7FAC5991: public key "Google, Inc. Linux Package Signing Key " imported
gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg: Total number processed: 1
gpg:               imported: 1

After that, type

gpg --export --armor 7FAC5991 | sudo apt-key add -

Where the 7FAC5991 is from the output shown before.

After that you’ll get OK as the output. You may run apt-get update again.

Oh, one more thing, I only tested this method in opera and google repositories

Banshee 1.0 Beta 2 in Ubuntu 8.04 Hardy Heron

kriwil — Wed, 28 May 2008 15:28:39 +0000

Now Banshee 1.0 Beta 2 is released. If you want to try the music player in your ubuntu hardy box, you could add sources.list entry from banshee PPA team.

Open software sources (System > Administration > Software Sources). In Third-Party Software tab, click Add and paste the code below

deb http://ppa.launchpad.net/banshee-team/ubuntu hardy main

If you need the source, you could repeat the Add proccess, and paste this

deb-src http://ppa.launchpad.net/banshee-team/ubuntu hardy main

Close the Software Sources. Wait for a few moment while the software update your package database. Then open the terminal, and type

sudo apt-get install banshee-1

Yes, use banshee-1. If you use banshee, you’ll get the old Banshee 0.13.2 from universe repository.

And, enjoy your new Banshee

Check Your System Compiz Capability

kriwil — Tue, 20 May 2008 16:49:30 +0000

There is a great script created to check whether your system is compiz ready or not. It’s called Compiz-Check.

Gathering information about your system...

 Distribution:          Ubuntu 8.04
 Desktop environment:   GNOME
 Graphics chip:         nVidia Corporation G70 [GeForce 7300 GT] (rev a1)
 Driver in use:         nvidia
 Rendering method:      Nvidia

Checking if it's possible to run Compiz on your system...

 Checking for texture_from_pixmap...               [ OK ]
 Checking for non power of two support...          [ OK ]
 Checking for composite extension...               [ OK ]
 Checking for FBConfig...                          [ OK ]

Checking for hardware/setup problems...            [ OK ]

If you got [ OK ] in every check, like mine, then your system is ready to run compiz. If something fails, go check the forum

How To Install Oracle XE in Ubuntu 64 Bit

kriwil — Mon, 12 May 2008 15:42:20 +0000

While you’re thinking by installing 64 bit linux you’re standing in the edge of new technology era, it sucks knowing our 64 bit system is less supported than the old 32 bit system. We have to install 32 bit flash since Adobe didn’t have the 64 bit one. We have to install 32 bit oracle xe since Oracle also didn’t have 64 bit version.

And now I will try explain how to install oracle xe into the 64 bit system, ubuntu way. Of course we couldn’t follow the guide from oracle, since apt-get will detect our system architecture and we won’t get the 32 bit packages list.

Before we start, make sure you have the 32 bit library installed. It’s in reposity, all you have to do is

sudo apt-get install libc6-i386

The next thing to do is download the files needed. It’s libaio_0.3.104-1_i386.deb and oracle-xe-universal_10.2.0.1-1.1_i386.deb. You could use wget for this

wget -c http://oss.oracle.com/debian/dists/unstable/main/binary-i386/libaio_0.3.104-1_i386.deb http://oss.oracle.com/debian/dists/unstable/non-free/binary-i386/oracle-xe-universal_10.2.0.1-1.1_i386.deb

After your downloads are finished, we continue to the main issue, forcing the package to be installed. You could try to install with usual dpkg -i first to make sure your system is really 64 bit.

sudo dpkg -i libaio_0.3.104-1_i386.deb

You’ll get error,

dpkg: error processing libaio_0.3.104-1_i386.deb (--install): package architecture (i386) does not match system (amd64) Errors were encountered while processing: libaio_0.3.104-1_i386.deb

Added guide from Venka A

sudo apt-get install bc

To force the installation, do these

dpkg -i --force-architecture libaio_0.3.104-1_i386.deb
dpkg -i --force-architecture oracle-xe-universal_10.2.0.1-1.1_i386.deb

And after the installation is finished, you need to configure it

sudo /etc/init.d/oracle-xe configure

and edit your ~/.bashrc

ORACLE_HOME=/usr/lib/oracle/xe/app/oracle/product/10.2.0/server PATH=$PATH:$ORACLE_HOME/bin export ORACLE_HOME export ORACLE_SID=XE export PATH

And, voila, the oracle xe is ready. You could go to http://127.0.0.1:8080/apex from your browser.

References:

Shorcuts for Managing Window(s)

kriwil — Sun, 11 May 2008 09:24:48 +0000

Since I’m not using any window decorator for my gnome setup, I always count on keyboard and mouse combination shortcut for managing my windows. These are my regularly used shortcuts when I’m working.

Alt + mouse button 1 (left mouse button): move window. Remember this, and your life would be lot easier. Seriously. I even bring this habbit to MS Windows. You don’t need to move your mouse to title bar and click it there to move the window. Just hold Alt button, and click anywhere inside the window, and you could move it anywhere.
Ctrl + Alt + d: show desktop. Easily “minimize” all your opened windows. Very useful when your desktop is cluttered and you want to open new application.
Alt + F9: minimize current window.
Alt + F8: resize current window. Having no window decorator makes resizing window a little bid harder. But Alt + F8 really helps a lot.
Alt + F7: move current window.
Alt + F10: maximize current window.
Alt + F5: unmaximize current window.
Alt + F4: close window. Some application could also use Ctrl + W, Alt + Q.

OpenOfffice.org 3.0 Beta

kriwil — Thu, 08 May 2008 00:16:39 +0000

OpenOffice.org 3.0 Beta is ready for testing.

OpenOffice.org 3.0 will support the upcoming OpenDocument Format (ODF) 1.2 standard, and is capable of opening files created with MS-Office 2007 or MS-Office 2008 for Mac OS X (.docx, .xlsx, .pptx, etc.). This is in addition to read and write support for the MS-Office binary file formats (.doc, .xls, .ppt, etc.).

See more features in the website, or go try yourself.

Is Ubuntu 8.04 Ready for Non-Tech Savvy?

kriwil — Mon, 28 Apr 2008 02:44:53 +0000

Maybe it’s very suprising to know that very easy task could be very complicated when it comes to non-tech user. Apparently, what we think easy enough is actually hard to do when the information isn’t clear. Content Consumer had a great experiment on how regular non-tech user (in his case, his girlfriend) doing things in Ubuntu 8.04.

The main issue with the desktop experience is that the geeky programmers and designers assume too much from the average user. They assume the user knows about the way in which programs are installed, or how the file system is set out. The average user will not go out of their way to google for help or even read the associated documentation that comes with Ubuntu and its default software. The little information pop-ups and guided wizards are critical to explaining how the user can accomplish the basic tasks they most probably are trying to do.
– The Great Ubuntu-Girlfriend Experiment

Great article, and definitely great input for ubuntu development team.

WebKit GTK+ Port

kriwil — Fri, 25 Apr 2008 14:39:16 +0000

Epiphany is always my browser-of-choise for my daily internet activities. It’s build on the real GTK, it’s simple, it’s light, and it’s integrated to Gnome. It is the konqueror of gnome. I’ve never had any memory leak when using Epiphany.

Epiphany is definitely fulfil my needs. I don’t need Firefox. Firefox is used only when I need it’s awesome Web Developer plugin (and Firebug, but now it didn’t work on Firefox 3 beta 5). I only use firefox when I need to design some html pages. Other than that, Epiphany is the answer. What? Adblock? Oh epiphany does have adblock.

But there is one think I always want to see in epiphany, the ability to choose rendering engine. Konqueror has this option. Konqueror user could pick Gecko or KHTML as the rendering engine. And now, KDE4 has webkit-enabled konqueror. Webkit itself is KHTML fork, and been said to be faster and better than Gecko (citation needed). Who doesn’t want faster browsing experience?

And now my dream is coming. Apparently, WebKit is being ported to GTK+. And if that is not good enough, it passed acid3 test, 100/100. For a comparison, Epiphany using Gecko 1.9 only scored 71/100.

Nice job for everyone involved. I can’t wait to use it