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App Lets You Edit Spell-check Dictionaries

A convenient feature of Mac OS X is its built-in spell checker, used by most Apple programs and accessible to any developer that wants to include the feature in… More: continued here

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How to check Server Load with Script

This script will email the server load l. The script is run every 15 minutes and very lightweight. #!/bin/bash LOAD=`uptime | awk -F: â€˜{print $5}â€™ | awk -F\, â€˜{print $1}â€™` RCPT=â€kamotegirl@pinoytux.comâ€ TIMESTAMP=`date +%D\ %T\ %Z` `uptime|mail -s â€œServer Load as of $TIMESTAMP is $LOADâ€ $RCPT` Then setup the cronjob to execute the script to run [...]

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How to check the version of a Linux OS

Console Command: uname -a is a linux command that will output useful information about your linux distribution, kernel version, cpu information and more. Example Output Linux computerName 2.6.22.18-desktop-1mdv #1 SMP Mon Feb 11 13:53:50 EST 2008 i686 Intel(R) Pentium(R) 4 CPU 3.40GHz GNU/Linux

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How to Share Your Own Computer’s Stuff with the Network

To share a file or folder with your fellow computer users, move the file into your Shared Documents folder, which lives in your My Computer window. (You must move or copy a file into the Shared Documents folder; shortcuts don’t always work.) After you place your file or folder into your Shared Documents folder, it [...]

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How to Increase Google PageRank

Google PageRank (PR) is a measure from 0 -10 of how important Google thinks a webpage is. In Google’s eyes a web page with a PageRank of 10/10 is very important and a web page with a PageRank of 0/10 is not very important. If you have theÂ Google toolbarÂ installed on your browser then it will [...]

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How to Optimize Your Hard Drive and Registry with CCleaner

There are plenty of system optimizers and registry cleaners out there, but today I will tell you about a great free one called CCleaner.Â It is very simple to use and can drastically increase your computers performance. CCleaner can delete all unnecessary temporary files from most browsers including IE, Firefox, Google Chrome and Opera as [...]

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Download Apple Safari 4: Worldâ€™s Fastest Browser

Now you can download the latest Apple Safari 4 web browser. Launching its latest beta version, Apple calls it theÂ worldâ€™s fastest web browserÂ for Mac and Windows computers. Apple Safari 4 powered by the newÂ Nitro JavaScript engineÂ claimsÂ to execute JavaScript 30 times faster than IE 7 and 3 times faster than Firefox 3; it loads HTML web [...]

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How to Check the ARP Tables in Linux

On some occasions, it is useful to view or alter the contents of the kernel’s ARP tables, for example when you suspect a duplicate Internet address is the cause for some intermittent network problem. TheÂ arpÂ tool was made for situations like this. Its command-line options are: arp [-v] [-t hwtype] -a [hostname] arp [-v] [-t hwtype] [...]

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How to Monitor MySQL’s performance

Here are some ideas, how you can monitor the database performance of your MySQL installation. Monitoring is always an iterative and continuous process. You need to learn what patterns are OK for your database and what are the signs of slight problems or even dangerous situations. Below are the main items you can use to [...]

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How to set up a basic email server with postfix and Dovecot

This article uses postfix as the mail transport agent (MTA), as opposed to sendmail, the default MTA for CentOS. Dovecot is used to allow users to access their email by either imap or pop protocols. We assume a domain name of example.com which should be changed by the reader and can be either a real [...]

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How to configure single IP Addresses in IPtables

Opening up a whole interface to incoming packets may not be restrictive enough and you may want more control as to what to allow and what to reject. Lets suppose we have a small network of computers that use the 192.168.0.x private subnet. We can open up our firewall to incoming packets from a single [...]

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A brief to various iptables commands

We will use an example based approach to examine the various iptables commands. In this first example, we will create a very simple set of rules to set up a Stateful Packet Inspection (SPI) firewall that will allow all outgoing connections but block all unwanted incoming connections:

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How to Install and Configure iptables under CentOS

Working with iptables from the command line requires root privileges, so you will need to become root for most things we will be doing. Iptables should be installed by default on all CentOS 3.x, 4.x and 5.x installations. You can check to see if iptables is installed on your system by: $ rpm -q iptables [...]

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How to Prevent Virus Attacks with Data Execution Prevention

Data Execution Prevention (DEP) is a Windows Vista security feature that can help prevent damage to your computer from viruses and other security threats by monitoring your programs to make sure that they use system memory safely. If DEP notices a program on your computer using memory incorrectly, it closes the program and notifies you. [...]

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How to Verify Email Security With tcpdump

I can use tcpdump to verify that encryption is working. Here is what a plain unencrypted POP mail session looks like. This is an abbreviated example showing only the initial three-way TCP handshake. You can do this yourself by firing up tcpdump, then checking mail. Ctrl+C stops it: # tcpdump port 110 15:04:49.050227 windbag.34348 > [...]

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