To allow custom mailbox folder for individual user:

Add/Edit "/etc/c-client.cf":

Add/Edit "~/.imaprc" for corresponding user:

All corresponding email files will now reside in the ~/mail folder for the corresponding user.

Screen is a program that allows you to have multiple logins on one terminal. It is useful in situations where you are telnetted into a machine or connected via a dumb terminal and want more than just one login.screen-profiles includes a set of profiles for the GNU screen window manager. These profiles are quite useful on server machines which are not running a graphical desktop.

Ftp can be secured using ftps to connect. Below outlines a configuration to support such a setup using TLS/SSL.

I usually use the epel repository to install proftpd:

Configure for tls/ssl connection:

chroot and bindsocket to listen to single IP:

Setup passive ftp ports:

Create the certs:

Create /etc/pam.d/ftp so PAM can authenticate for proftpd:

Add "/bin/false" to "/etc/shells" file and use it as the shell type when creating new users:

Usually, if a client is behind firewall, they can only trasfer files via a passive ftp connection.

Edit /etc/proftpd.conf and specify the passive ports range. Place it in the 'Global' container:

Reference: proftpd.org

Load the ip_conntrack_ftp module and iptables rules, so the ports automatically open to the connected client:

Add the below iptables rules:

If the server is beind NAT, ip_nat_ftp module also should be loaded:

IPplan is a free opensource IP Address management application. IPPlan is a web based IP address management software and tracking tool simplifying the administration of your IP address space. IPplan goes beyond IP address management including DNS administration, configuration file management, circuit management and storing of hardware information.

When a process exits (normally or abnormally), it enters a state known as “zombie”, which in top appears as "Z". Its process ID stays in the process table until its parent waits on or "reaps" it. Under normal circumstances, when the parent process fully expects its child processes to exit, it sets up a signal handler for SIGCHLD so that, when the signal is sent (upon a child process's exit), the parent process then reaps it at its convenience.

As long as the parent hasn't called wait(), the system needs to keep the dead child in the global process list, because that's the only place where the process ID is stored. The purpose of the "zombies" is really just for the system to remember the process ID, so that it can inform the parent process about it on request.

If the parent "forgets" to collect on its children, then the zombie will stay undead forever. If the parent itself dies, then "init" (the system process with the ID 1) will take over fostership over its children and catch up on the neglected parental duties. If the init process is stalled, then you have much bigger problem than child processes not being reaped. In fact, a crashed init process will usually cause a kernel panic.

When you visit a Secure website in Firefox chances are that the FavIcon for the website is replaced with a Green bar with the details of the company. This is because of the default properties in Firefox to display detailed information of the website from the Extended Validation Certificate on the website. However, if the website doesn’t host a Extended Validation certificate then the website URL (link) in the address bar is not highlighted or in otherwords shows as a normal website URL.

MPlayer is a movie and animation player that supports a wide range of codecs and file formats, including MPEG 1/2/4, DivX 3/4/5, Windows Media 7/8/9, RealAudio/Video up to 9, Quicktime 5/6, and Vivo 1/2. It has many MMX/SSE(2)/3Dnow(Ex) optimized native audio and video codecs, but allows using XAnim’s and RealPlayer’s binary codec plugins, and Win32 codec DLLs. It has basic VCD/DVD playback functionality, including DVD subtitles, but supports many text-based subtitle formats too.

Minicom is a clone of the MS-DOS “Telix” communication program. It emulates ANSI and VT102 terminals, has a dialing directory and auto zmodem download.

Swiftfox is yet another free browser which is an optimized build of the Mozilla Firefox web browser. The browser is fully compatible with any existing themes, extensions for Firefox.