downtimed is a program that monitors operating system downtime, uptime, shutdowns, and crashes and records such events. At OS startup it logs information about previous downtime. It then periodically updates a time stamp file on the disk, which is used to determine the approximate time when the system was last up and running. During a graceful system shutdown, it records a time stamp in another file. The downtimes(1) command line tool can be used to inspect records of past downtime.
radns is a small, portable client-side implementation of the RDNSS option in IPv6 Router Advertisements (RFC 5006) that is used to get the address of a resolving DNS server. It listens for Router Advertisements with the Recursive DNS Server (RDNSS) option and stores the addresses in a file following the same syntax as resolv.conf. It optionally calls a script to handle, for instance, DHCP clients that compete for ownership of /etc/resolv.conf or to set the DNS server on systems that don't use resolv.conf at all. It can be easily integrated with the resolvconf(8) program.
Simple Login Class is a PHP class that can be used to prevent unauthorized access of Web pages. A simple user management system can be implemented with this class very quickly. It does not use databases or database queries to store the user details. Instead of a database, it uses a text file to store the details. An access encoding technique (Base64), two hashing techniques (SHA1 and MD5), an a built-in PHP function (StrRev) are used here to store passwords more securely in the text file. Simple Login Class can be used in any PHP page just by embedding a snippet at the top of a the page to be protected. Any number of user logins can be stored more securely in a single file. The sessions are handled more safely in this system than some other login systems. The user registration system applied here is simplified. In certain cases, no configuration is needed to use this class.