JGiven with Spring

In a previous post we talked about how to create a basic Spring MVC web with junit for test driven development (TDD). Here we are going to include behavior driven development (BDD). To accomplish this goal we will use the JGiven library.

Continue reading

Advertisements

How to clear the CUPS print queue

To cancel a print job in the queue just use cancel. To see all the available jobs in the queue just use lpstat.

$ lpstat -o
HP-Officejet-7610-2-128 user2     240640   mié 09 mar 2016 11:07:14 CET
HP-Officejet-Pro-8620-137 jose             55296   dom 03 jul 2016 13:29:49 CEST
$ cancel -a HP-Officejet-7610-2-128
$ cancel -a HP-Officejet-Pro-8620-137

How to compile the linux kernel

Download a kernel source from kernel.org and let’s suppose that it is extracted in the directory ~/linux-x.yy.zz

Sometimes it can be a good idea to start with a current kernel configuration. You can get this configuration from the text file /boot/config-xx.yy.zz or a compressed version from /proc/config.gz. Copy the text file into ~/linux-x.yy.zz/.config.

Now you can start configuring the new kernel by executing inside the dir ~/linux-x.yy.zz/:

make menuconfig

Then compile the kernel, the modules and the image:

make
make bzImage

If everything it’s ok the new kernel will be in ~/linux-x.yy.zz/arch/x86/boot/bzImage. Copy this file to the boot directory in the desired machine:

cp ~/linux-x.yy.zz/arch/x86/boot/bzImage /boot/vmlinuz-x.yy.z

Now you have to compile and install the modules:

make modules 
make modules_install

This will copy all the firmware and modules to /lib/firmware and /lib/modules/x.yy.z. If you want to change the directory you can do it by defining the INSTALL_MOD_PATH environment variable.

After install all the modules you have to go to /boot directory, create the initramfs and update the grub.

update-initramfs -c -k x.yy.zz
update-grub