Imagine you’re a developer working on a project that’s stored in a remote Git repository. Your first step is to clone the repository using the command git clone git@github.com:some-account/some-project.git.

Once you’ve cloned the …

Generate a random string using the command line:

1cat /dev/urandom | tr -cd [:graph:] | head -c 32

On OSX, the previous command might return a tr: Illegal byte sequence error, so try:

1export LC_ALL=C; cat /dev/urandom | tr -cd [:graph:] | head -c 32 …

A command so important, it deserves its own page:

1git reset --soft HEAD~1

The previous command undoes the last commit to git. I think this is one of those commands that I have typed many times during the last year. It’s very important to know …

Netbeans is one of my beloved day to day applications. Yesterday, when I installed Ubuntu 15.10 (Wily Werewolf) on my computer, Netbeans started to hang on the startup screen, specifically at the Loading Modules phase. It took me hours looking for …

If you are new on the Linux platform, I am sure you feel overwhelmed with all the different versions available. Choosing one is not an easy task, and each version has its own pros and cons.

Let me tell you why I like CentOS:

• It is very stable
• It has …

The CentOS distribution is a famous and stable Linux version derived from RedHat Linux. It’s been one of my favorites and one that you can easily find with hosting providers.

In this article we will install CentOS and OracleXE. It’s worth mentioning …

Redirecting all your program output to a file is very simple and can be accomplished like this:

myapp > output.log

This line will send all the output generated by myapp to a file named output.log. The contents of output.log will always be …

Java 1.5 is the default Java version you get when you ask yum to install it on CentOS. However, several applications need 1.6 in order to run. Just follow the next steps to install it.

Remove Java 1.5

1yum remove java-1.5-*

Install the rpmforge …

iptables is the default firewall you see on any linux computer. It works by allowing (ACCEPTing) or denying (DROPing) connections to the local computer. There are basically three scenarios you can deal with:

1. INPUT: Connections generated from a …

The first step is to configure the repositories. Create the following file /etc/yum.repos.d/10gen.repo with the following contents:

For 32-bit systems:

[10gen]
name=10gen Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/i686 …