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Manipulating PDFs with the PDF Toolkit

Creating and reading PDF files in Linux is easy, but manipulating existing PDF files is a little trickier. Countless applications enable you to fiddle with PDFs, but it's hard to find a single application that does everything. The PDF Toolkit (pdftk) claims to be that all-in-one solution. It's the closest thing to Adobe Acrobat that I've found for Linux.

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Bandwidth monitoring with iptables

By Gerard Beekmans

Linux has a number of useful bandwidth monitoring and management programs. A quick search on Freshmeat.net for bandwidth returns a number of applications. However, if all you need is a basic overview of your total bandwidth usage, iptables is all you really need -- and it's already installed if you're using a Linux distribution based on the 2.4.x or 2.6.x kernels.

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Managing Linux daemons with init scripts

 

When you install a new Linux server distribution, you can often install all of the daemons you'll need to run on that machine at install time. Distribution vendors present a "ready to go" distribution by supplying initialization scripts for all of the services you might run. But what happens if you're building from source, and no init script is supplied? What if you're writing the source and haven't ever built an init script? Here are a few ways to cope when you're faced with this challenge.

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Check your DNS records with dig

Have you ever wanted to query the Domain Name System (DNS) to discover what information it holds about your domain? Do you have some important changes to make to your DNS records and need a way to verify your changes? Here's how to check your DNS records with a tool called dig.

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Increase your available swap space with a swap file

You've finally configured every aspect of your Linux system. All of your devices function, and everything is configured just the way you like it. At least you think so, until you start running out of memory when you have OpenOffice.org and lots of browser tabs open simultaneously. You realize you should have specified a larger swap partition during your install. Does this mean you have to install again from scratch? Happily, no. Here's how to set up some extra swap space on one of your existing partitions.

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