inetd is referred to as the Internet Super-Server because it manages connections for several services. When a connection is received by inetd, it determines which program the connection is destined for, spawns the particular process and delegates the socket to it. First login as a root user. FreeBSD version 5.0/6.0 or later Newer version of [...]

grep xxx@xxx.com /var/log/exim_mainlog | grep “<=” | awk {’print $3′} | wc -l

How to view core.xx files in Linux? The core.xxx files are created on Linux servers and holds the current state of a process working memory when a process is crashed. To view the core.xx files in Linux, execute the command: root@host [~]# strings core.xxx It will list different state of a process on each line.

The error message “Unable to load dynamic library ‘/usr/lib64/php/modules/ffmpeg.so” is received when you add the ffmpeg.so extension to the PHP configuration file i.e. php.ini file and tries to run PHP. You can easily reproduce the error message by executing “php -v”: PHP Warning: PHP Startup: Unable to load dynamic library ‘/usr/lib64/php/modules/ffmpeg.so’ – /usr/lib64/php/modules/ffmpeg.so: undefined symbol: [...]

This is a short but potentially extremely handy guide to ghosting one Linux box to another (or simply making a full backup of a desktop/server). Credit goes to ‘topdog’ for this. You might have a small office where you customise one desktop just how you like it and need to roll this out to N [...]

I’m making a post about this because I ran into this today and I couldn’t remember how to rename a file starting with — (two or double hyphens) in Linux (e.g. –index.html). The customer has obviously used a Windows FTP client to rename index.html to –index.html so it is out of their way, and now [...]

Today I discovered Ketchup, a little command-line tool to manage your Linux kernel sources. If you’re one of the weirdos, who is still compiling his kernel manually for whatever reason (like I do), I can only recommend it. Ketchup nicely eases up the entire process of checking for updates and applying them to your system. [...]

If the .htaccess has an error you should get a 500 error when you try to access the website. Is that the case? You can check if mod_rewrite is compiled in with Apache doing: httpd -l | grep mod_rewrite.c If it’s not then you should re-compile Apache. You could also enable mod_rewrite logging: RewriteLog “/var/log/httpd/rewrite.log” [...]

This tutorial shows how to install and configure BASE (Basic Analysis and Security Engine) and the Snort intrusion detection system (IDS) on a Debian Sarge system. BASE provides a web front-end to query and analyze the alerts coming from a Snort IDS system. With BASE you can perform analysis of intrusions that Snort has detected [...]

You can use the wall command to send a message to every user on a system. General syntax of wall command is as follows: wall Message Message … …. .. When the message is complete, press Control-D. 1) To display message “Disk failure system will be down for 30 minute” to all users use wall [...]