Spam has become a regular feature in today’s inboxes especially as it now appears as text-based spam, image spam and attachment spam. Unfortunately it is the downside of having an email address that is in use regularly and something that is generally accepted by most people. Many users and can determine what mail is spam and what is legitimate; however, spammers are con artists who continuously try to camouflage spam to make it appear as valid email coming from credible sources and containing valid content, fooling both users as well as anti-spam filtering software. The latest trend in spam creativity deals with attachment spam. Read the rest of this entry »
Email is still the most popular form communication between people, both in their personal and professional live. The ability to attach photos, files, and documents to these emails is an extra advantage, however these attachments may not be what they seem. Read the rest of this entry »
One of the most common tools we are using on a daily basis, is email. Due to this fact, email is also a major security problem, due to the fact that a lot of worms and trojans are using email to get into our computers.
The main problem with emails comes from using email attachments. While email attachments represent a useful addition to email functionality, as a way to send files via email, they are also risky due to the fact that email attachments can contain not just documents, but also binary attachments like executable files. Such email attachments can be dangerous as they may contain worms and trojans that can immediately infect our computers, once opened by the unsuspecting user.
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UltiDev Cassini Web Server is a light-weight redistributable web server software for Microsoft Windows capable of simultaneously serving multiple ASP.NET applications and static HTML. Unlike Internet Information Services UltiDev Cassini can run on Windows Operating Systems which do not support IIS. UltiDev Cassini is based on the original Microsoft Cassini sample[1]. Read the rest of this entry »
Node.js is an amazing new technology, but, unless you’re specifically a JavaScript developer, the process of becoming acquainted with it can quickly become a bit overwhelming. But that’s why we’re here! If you want to really learn how to use Node.js, this set of articles and screencasts will do the trick. Read the rest of this entry »
Like me you maybe using an Ubuntu computer running Apache, MySQL and PHP to develop websites. When developing it is important to see error messages to debug your code. On occasion I have installed PHP on to Ubuntu computers and by default errors are not displayed. As this is not a production web server I updated the php.ini file to display errors. In this post I explain how I updated the php.ini to display error messages and aid debugging. Read the rest of this entry »
Deleting old files in Linux is often necessary. Often logs need to be periodically removed for example. Accomplishing this through bash scripts is a nuisance. Luckily there is the Find utility, it allows a few very interesting arguments, one of them is executing a command when a file is found. This argument can be used to call rm, thus, enabling you to remove what you find. Another argument Find allows can specify a time in which should be searched. This way you can delete files older than 10 days, or older than 30 minutes. A combination of these arguments can be used to do what we want. Read the rest of this entry »
The following table is a list of linux commands found on a Redhat 9.0 server.
To see a list of bash shell commands, go to the shell commands page.
For those of you who are unsure how to use linux commands, see our Linux Commands Tutorial.
If you are already used to using linux commands, you may want to go straight to our Linux Man Page Viewer.
Click on the command name or the 
to see a description of the command. Read the rest of this entry »
PHP allows you to change the HTTP headers of files that you’re writing, so that you can force a file to be downloaded that normally the browser would load in the same window. This is perfect for files like PDFs, document files, images, and video that you want your customers to download rather than read online.
Q. How do you set-up SSH with DSA public key authentication? I have Linux laptop called tom and remote Linux server called jerry. How do I setup DSA based authentication so I don’t have to type password?
A. DSA public key authentication can only be established on a per system / user basis only i.e. it is not system wide. You will be setting up ssh with DSA public key authentication for SSH version 2 on two machines: Read the rest of this entry »
