Resetting Root Authorization in Linux and Prevention

                         The root authentications can be reset to NULL value from the following method.

Do not use this information for committing cyber crimes.

How to Boost Surfing  speed?

                 Boost your surfing speed with just some tweaks. Most of the users using these tweaks give a pretty positive feedback of a boost in their surfing speed.
 

Asterisk/astguiclient install from scratch. v.2.0.4 part 2

           Continue from part 1.......... you can find part 1 of the article at here .

Asterisk/astguiclient install from scratch. v.2.0.4

                 This document is meant to be a very in-depth step-by-step explanation of installing the Asterisk open-source PBX on a Linux system and also installing the astGUIclient suite. The instructions will assume starting from nothing and will try to give several side step instructions to account for some differences in choices of hardware and software.

Using Screen for Session Management

                 Lost your shell connection? Need multiple shell sessions?

You are logged into your remote server via SSH and happily plucking along at your keyboard and then it happens. Suddenly, the characters stop moving and then you get the dreaded "Connection Closed" message. You have just lost your session. You were halfway through some task and now you have to start over. Ugh. Well you can prevent this from happening by using screen. Screen can not only save you from disconnection disasters, but it also can increase your productivity by using multiple windows within one SSH session.

25 Things You Did not Know VoIP Could Do

Posted in Voipnow.org

                 One of the greatest advantages of VoIP over traditional phone service is its versatility, but with the wide array of new features coming out it can be hard to keep track of all of the options that are available. Don’t feel bad, unless you are attached at the hip with your computer it can be almost impossible to keep up- but that doesn’t mean you shouldn’t be enjoying the same features as those with a less healthy attachment to their computer. Here are a few ways to get you started using your VoIP in ways that you might not have thought possible.

Of Zeros and Nulls

              /dev/zero ... /dev/null

Uses of /dev/null

Think of /dev/null as a black hole. It is essentially the equivalent of a write-only file. Everything written to it disappears. Attempts to read or output from it result in nothing. All the same, /dev/null can be quite useful from both the command line and in scripts.

/dev and /proc in Linux

Table of Contents

A Linux or UNIX machine typically has the /dev and /proc special-purpose directories.

Arrays in Shell Scripting

                   Newer versions of Bash support one-dimensional arrays. Array elements may be initialized with the variable[xx] notation. Alternatively, a script may introduce the entire array by an explicit declare -a variable statement. To dereference (retrieve the contents of) an array element, use curly bracket notation, that is, ${element[xx]}.

List Constructs

                     The and list and or list constructs provide a means of processing a number of commands consecutively. These can effectively replace complex nested if/then or even case statements.

Aliases in Shell Script

              A Bash alias is essentially nothing more than a keyboard shortcut, an abbreviation, a means of avoiding typing a long command sequence. If, for example, we include alias lm="ls -l | more" in the ~/.bashrc file, then each lm typed at the command line will automatically be replaced by a ls -l | more. This can save a great deal of typing at the command line and avoid having to remember complex combinations of commands and options. Setting alias rm="rm -i" (interactive mode delete) may save a good deal of grief, since it can prevent inadvertently losing important files.