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Another Bash One Liner To Delete Old Directories

We received a tip from blog readers Christian and Michael for alternatives to the command to delete all directories older than a certain period of time. These both work in bash and can be used in scripts to clean up old backup directories or any situation where you need to delete old directories from the […]


Currently I am in the Computer Science Master’s Program at West Chester University and I am focusing my research on Location Based Updates in Social Media and their societal and security implications. So you can say I think about this topic more than most normal people do.

FourSquare is a growing service that allows you to “Check in” to restaurants, grocery stores, museums and just about any place you can imagine. However, I have seen several of my friends checking in to locations which, I must say as a security research student, set off warning bells. Although I am calling out FourSquare specifically, these also apply to just about any other location based software where you broadcast your location to other folks, whether they are your friends or the general public. GoWalla and BrightKite are in the same boat.

Without further ado… here is my list of top FourSquare Security Faux Pas (after the break…)


It is very easy to create a random file using the linux command line. Much like the command to fill a file with all zeros, for example a 1 Meg file: dd if=/dev/zero of=zero.filename bs=1024 count=1000 You do the same using /dev/urandom: dd if=/dev/urandom of=random.filename bs=1024 count=1000 Resulting in a 1MB file: 1000+0 records in […]



I was recently tasked with copying speaker’s presentations, files and handouts onto 100s of USB Drives (key drives) for a conference that work is hosting down in Washington, D.C. My first thought was that it was going to be a pain to have to copy/paste the files to each drive. I thought about creating a […]



Firefox Blinking Cursor Issue

For some reason, Firefox started to display a blinking cursor, like web pages I have been viewing were editable. Thinking that some errant plugin was causing this behavior, I manically disabled a few I had recently installed. However that didn’t fix the problem. Good ole Google to the rescue. Firefox has a ‘feature’ that lets […]