A hash function takes arbitrary sized data and outputs a number in a fixed range. It always outputs the same number for the exact same data. If the data changes by even one bit the hash also changes. Hashes are used to ensure data integrity by creating “fingerprints” of data.
Apticron is a debian package that emails you when there are updates that you have to install. To customize when apticron runs you can do the following:
SFTP is a secure alternative to FTP. Authentication is done via SSH and a secure tunnel is established for the entire file transfer session. In this article I look at how to restrict a user’s access to SFTP only and to a specific directory on the server.
Screen is a great tool for running multiple shell instances using a single SSH connection or virtual console. Here’s a quick start guide to screen.
The Debian developers announced last month that an outside team would be providing Long Term Support (LTS) for Debian 6.0 aka Squeeze. This means that you can continue using Debian Squeeze until February 2016.