Quiz on chapter-2 of book Linux Device Drivers

Quiz on chapter-2 of book ldd3 Quiz on chapter-2 of book ldd3 Function passed to module_init is invoked when Module is loaded into ...Read more »

djpeg to convert jpeg images to .gif,.bmp etc

djpeg(Decompress jpeg) command can be used to convert the jpg or jpeg format images into .bmp ,.gif and other formats. For example let us...Read more »

Formatting text files using fmt

The command fmt allows us to format text file easily. We saw how to wrap text using the command fold, in the post " Wrapping lines i...Read more »

What is cross compilation

The desktops and laptops that we use in our daily lives are mostly of x86 architecture. Thus when we compile a program using the usual compi...Read more »

pthreads-3: Canceling a thread

Threads once created using pthread_create,can some times be required to be stopped in between before they complete their execution. This ca...Read more »

Finding the string length in scripting

Here are three scripts for finding the length of string using scripting 1. Using bash string operation #!/bin/bash echo "Enter the s...Read more »

pthreads-2: Creating a detachable thread

In the post " pthread creation " we saw how to create a simple thread and we had used the default attributes for the thread. One ...Read more »

Highlighting the output of grep

grep is used for searchin for a string or a pattern in a given input stream. By default the grep ouputs the whole line in which the search s...Read more »

pthreads-1 :Creation of a thread using pthreads

pthreads are posix threads supported by the unix based systems. The pthread library allows us to create multiple threads in the user space a...Read more »

Launching a GUI window as root (superuser)

To launch an GUI window as root, we can use the command gksudo. for e.g. if we want to open the nautilus file browser as root then ...Read more »

Grabing or moving a window using keyboard

Some times the terminal window or other GUI windows move to uncomfortable positions, from where we are unable to grab the title bar using th...Read more »

Compiling linux kernel on debian

Here are the steps to compile a kernel from source in debian based systems. Note:These steps have worked successfully on debian 6.0 (linux 2...Read more »

Finding out the amount of RAM being used

To find out the amount of RAM and swap space being used by all the processes in the system we can use the command free for e.g. free: ...Read more »

ejectiing a cdrom from the command line

The cd/dvd drive, which is usually ejected by pressing the button on the drive can also be controlled from the command line. The command to...Read more »

bash: ifconfig: command not found

bash: ifconfig: command not found This is a very common error which lot of us might have encountered for commands like ifconfig,insmod,modp...Read more »

Displaying the commands being run by make.

Make files are used to compile multiple source files and to generate executable from the source code. If we want to check what are the f...Read more »

Creating a triangle of characters in the terminal

Here is a script that crates a triangle of what ever character we choose. The triangle gets created right at the center in the terminal. ...Read more »

pgrep: grep of processes

pgrep searches in the currently running processes for processes that match the search criterion passed as the argument. For e.g. If we wa...Read more »

Finding the process id from its name

Every process in linux has a unique process id, which can be used to control the process. To find the process id from the process name we c...Read more »

Launching gnome help from terminal

When using the gnome desktops, its common to use the function key F1 to launch the genome help window. But same can also the done from the c...Read more »