When last month is not last month

When you type in Linux Bash: date +%Y%m -d '1 months ago', you assume you'll get the year and month of last month. Well, for a reason that I've got yet to discover (probably very logical), not the case for today's

Edit content of JW Library backup files

The JW Library app allows you to export your precious notes. For geeks and hackers who wants to modify these note automatically (with Python for example, or directly with a SQLite editor), it can be tedious to: * unzip the backup file * zip the content back into the backup file The

What is a Layer 3 switch really?

Depending on who you ask, the answer will be different. It seems everyone has an opinion about what a Layer 3 switch is. I have my own personal definition, which is based on the OSI model. Also, some definitions really beat around the bush. All of this creates confusion [http:

Linux Security Resources on the web

For the trainees attending the Learning Tree course #433 [http://www.learningtree.fr/courses/fr433.htm] in Paris about UNIX and Linux Security, here is a html file [/content/images/wordpress/2012/12/Favoris-Securite-251212.html]containing interesting bookmarked websites (in french and english).

[IPv6] Why 6to4 is obsolete

6to4 is a good idea in its concept. Still, it brings its lot of problems. These are mainly due to the fact that a common network prefix, 2002::/16, is advertised on the IPv6 Internet by all the ISPs doing 6to4 : [https://bibelo.info/content/images/wordpress/2012/12/Problemde6to4ADV.