Using ctags with Vim

I have been using vim for all my coding related tasks for a year now. I heard of ctags a while ago but I never tried using it. But recently I got tired of moving between files manually -looking for functions and other stuff- so I decided to give ctags a try. I never expected for it to be so simple. Just install ctags:

sudo apt-get install ctags

Generate tags file. To do this go to the main directory of your source tree. There just issue the command:

ctags -R

this will recursively traverse the source directory and generate a tags file containing information about all symbols -functions and variable- in the source files.
Using Vim with ctags is straight forward. Vim has builtin support for ctags so now you just need to issue vim command from the directory where you generated the tags file using ctags.

vim src/asdf/test.c

Now in the file move a cursor to some function or variable and press Ctrl-]. This will take you to the definition of that function or variable. To go back to where you came from press Ctrl-T, this will take you back to where your were before pressing Ctrl-]

If you have more than one tags files or you dont want to always use vim from one directory then add following line to your .vimrc file in your home directory:

set tags=tags;/

Connect To PTCL EVDO(Evo) from Ubuntu Linux

PTCL Evo connection comes with ZTE AC2726 USB modem. Its really easy to use it on Windows and Mac as there drivers are provided in the modem's memory but to use it on Linux is a bit tricky. Recently I succeeded in installing and configuring it on Ubuntu 9.10 and below are the steps which worked for me.
When you attach the modem to your linux machine it gets detected as a usb storage device and not as a usb modem. To use it as usb modem we need to convert it from usb-storage device to usbserial device in ubuntu. To do this I used -modeswitch utility which can be installed using following command:

sudo apt-get install usb-modeswitch

Unplug the modem and plug it back in. Use lsusb command to see list of usb devices attached to your system. You should see a line similar to

Bus xxx Device xxx: ID 19d2:fff1

Here 19d2 is vendor id for ZTE and fff1 is the device id for AC2726. If you dont see this line or see one with device id fff5 then you will need to restart your system. Now issue following command to load proper driver module in kernel:

sudo modprobe usbserial vendor=0x19d2 product=0xfff1

And thats it. Your modem is ready to be used. You will now need a dialer app to dial and establish the connection. I used gnome-ppp as it has the ability to dock. To install gnome-ppp issue following command:

sudo apt-get install gnome-ppp

You can now run gnome-ppp. You will need to run it as root. After it starts click on setup. On setup window click Detect so that it can detect your usb modem. Set type to be USB MODEM and speed to be 460800. Set phone line to Tone and volume to off. Now go to options tab and check the following:

• Dock in notification area
• Auto reconnect
• Ignore terminal strings..
  

Now click close. You will be taken back to smaller window. Enter vwireless@ptcl.com as user name and ptcl as password. Enter #777 as phone number and click connect. and you will get connected to ptcl evo service.

UPDATE: if you are using Ubuntu 10.04 or later you can use a simpler method mentioned here

Free office space, room, pocket money, internet, food and advice for startups

Unfortunately its for UK or European startups only but its a great thing. Check out more details here http://blog.businessofsoftware.org/2009/08/the-accidental-incubator.html

Enable syntax higlighting for Vim in Ubuntu

Ubuntu comes with a minimal Vim installation known as tiny Vim. This doesn't have features like syntax highlighting and GUI. Tiny Vim is more compatible with Vi because most of the features that Vim adds to Vi are not there. So people looking for standard Vi may like it but I like to have syntax higlighting and to use arrow keys to move in the document rather than ctrl key. So if you want these features you will need to install complete Vim. You can do that using the following command:

sudo apt-get install vim-full

if at some point you want to turn highlighting off, issue following command from inside vim:

:syn off

to turn it back on you can use:

:syn on

Good luck

Solving Skype audio problem in Ubuntu 9.04 (Jaunty)

I installed Skype on Jaunty but my audio was not working even though i was able to record my voice using Sound Recorder. After going through many web pages and trying many solutions the one that finally worked for me is this.

stop skype, open terminal and issue following commands

1. sudo killall pulseaudio
2. sudo apt-get remove pulseaudio
   
3. sudo apt-get install esound
4. sudo rm /etc/X11/Xsession.d/70pulseaudio

now start skype and every thing works fine.

Dock Evolution Mail to notification area in Ubuntu

If you are using Evolution for your email needs then you must be aware that Evolution doesn't dock. So either you leave it open, in which case it will be continuously cluttering you window list, or you just close it. But then you wont get new mail notifications. But there is a third option, although Evolution doesn't dock itself, you can use another application called alltray to dock it. alltray can be used to dock any open window to notification area. Its really simple to install and use.
you can install it using

sudo apt-get install alltray

after installing just run alltray from command line or Alt-F2 using command

alltray

a dialog will appear asking you to select window that you want to dock. it will also change you cursor. when you select a window it will be immediately docked to notification area.If you dont like this approach and want an application to have notification icon as soon as it starts then you can launch an application with alltray. So for Evolution you can write following command:

alltray evolution

this will start evolution and immediately dock it to notification area.

if you want application to show when it starts then you can use --show option for alltray

alltray --show evolution

There are other alltray options that you may want to use e.g. --sticky for showing application on all desktops, --no-alltray to stop alltray from adding alltray to applications title and etc. use alltray -h for details of available options. You can also change edit the menu entry for evolution in Applications->internet to this command so that whenever you launch evolution it has dock i con

Converting .rpm packages to .deb for Ubuntu

If you want to install a package on Ubuntu, but can only find .rpm for it and no .deb then you can use Alien to convert that rpm into a .deb package.

Alien is a computer program that converts between different Linux package formats. It supports conversion between Linux Standard Base, RPM, deb, Stampede (.slp), Solaris (.pkg) and Slackware (.tgz) packages. It is also capable of automatically installing the generated packages, and can try to convert the installation scripts included in the archive as well. The latter feature should be used with caution since Linux distributions may vary significantly from one another, and using install scripts automatically converted from an alien format may break the system.
http://en.wikipedia.org/wiki/Alien_(software)

Alien can be installed from universe repository. You will need to enable it first. After enabling universe repo do:

sudo apt-get update
sudo apt-get install alien

This will install alien. After installing alien you can convert rpm to .deb using command

sudo alien -k package-name.rpm

This will generate a new file named package-name.deb. The -k option is used to keep the version number, otherwise alien will add a 1 to it. Using --scripts option will also include scripts from rpm into .deb.

sudo alien -k --scripts package-name.rpm