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How to Analyze Network Performance using iperf on Fedora, CentOS & Windows

I’ve been experiencing some slow network connections between a couple of Linux systems (CentOS), Window systems (Server 2008R2), and a NAS device (Netgear ReadyNAS) and wanted to confirm that my network connections weren’t the source of the problem. To limit any variability due to different tools, I decided to use iperf, which can run on […] Continue reading

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[one-liner]: Using tcprobe to Detect a DVD’s Video Format, PAL or NTSC, via the Command Line

Background

Having kids I’m always dealing with DVDs, either backing them up or repairing them. Recently we received a bunch of DVDs from a friend of various kid movies. Some of them just refused to play in our DVD player and being a geek who’s curious I wanted to better understand why. Turns out the DVDs […] Continue reading

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[one-liner]: Opening CAD/CAM .dwg/.dxf Files under CentOS/Fedora/RHEL

Background

A co-worker of mine handed me some .dwg & .dxf files which I’d never seen before. Turns out they’re AutoCAD/AutoDesk files, but I had a hard time finding a decent viewer under Linux.

.dwg – a binary file format used for storing two and three dimensional design data and metadata
.dxf – Drawing Interchange Format, or […] Continue reading

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[one-liner]: Getting Networking Info from the Command Line using NetworkManager’s nm-tool Command

Background

This is just a quick post to capture a pretty useful networking command line tool, nm-tool, that’s included with NetworkManager.

Solution

nm-tool is really nice in the sense that it takes information from a lot of other command line tools, (such as ifconfig, iwconfig, iwlist, etc.) and integrates it into a single command. For example:

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# output from […] Continue reading

Posted in centos, fedora, networking, one-liner, redhat, rhel, Syndicated, tips & tricks | Comments Off on [one-liner]: Getting Networking Info from the Command Line using NetworkManager’s nm-tool Command

[one-liner]: Determining a CD/DVD Drive’s Write Speed Capabilities under Fedora/CentOS/RHEL

Background

Here’s a quick primer on how to determine the capabilities of a CD/DVD drive you may have on your Linux laptop or desktop using the little known command wodim. In truth, wodim is actually the app behind cdrecord & dvdrecord, which are little more than aliases.

NOTE: it’s available as wodim-1.1.11-3.fc14.x86_64 in the default Fedora 14 […] Continue reading

Posted in cd, centos, DVD, fedora, one-liner, performance, redhat, rhel, Syndicated, tips & tricks | Comments Off on [one-liner]: Determining a CD/DVD Drive’s Write Speed Capabilities under Fedora/CentOS/RHEL

[one-liner]: Archving a Directory Tree into a CD or DVD via the Command Line Using mkisofs on Fedora 14 & CentOS 5

Background

Recently I was putting together a script to build an archive of all the various files that a project was comprised from. One of the final tasks was to burn the entire lot of files to a CD or DVD, so I took the opportunity to figure out how to do this from the command […] Continue reading

Posted in cd, centos, DVD, fedora, one-liner, redhat, rhel, Syndicated, sysadmin, tips & tricks | Comments Off on [one-liner]: Archving a Directory Tree into a CD or DVD via the Command Line Using mkisofs on Fedora 14 & CentOS 5

[one-liner]: How to Backup a Movie DVD via the Command Line on Fedora 14 & CentOS 5

Background

Have you ever wanted to make a backup copy of a DVD via the command line? I don’t really care about the politics/legal issues around this simple task, I have 3 kids and don’t really feel like purchasing multiple copies of the same discs. So here’s a quick and dirty way to accomplish the […] Continue reading

Posted in centos, DVD, fedora, one-liner, redhat, rhel, Syndicated, tips & tricks | Comments Off on [one-liner]: How to Backup a Movie DVD via the Command Line on Fedora 14 & CentOS 5

[one-liner]: OK’ing a Dialog Box that’s Displayed Partially Off Screen Under GNOME

Background

I recently ran into this problem where I was presented by Fedora’s package manager with a dialog box that had its OK/Cancel buttons being displayed off screen. This solution doesn’t necessarily fix this problem, but does give you a way to work around it.

Solution

The solution is pretty straightforward. Within GNOME there is a keyboard/mouse binding […] Continue reading

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[one-liner]: Increasing a KVM guest’s Memory on CentOS 5

Background

Recently the need came up to increase the amount of RAM I had allocated to an already running KVM guest VM on a CentOS 5 KVM host. This is a pretty easy task using other virtualization technologies so I assumed, maybe foolishly, that this would be an easy task using KVM too. Looking […] Continue reading

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Getting the BlogTNG plugin working in Dokuwiki under CentOS 5

Background

BlogTNG is a blogging plugin that provides a pretty basic though usable blog within the wiki software, Dokuwiki. I wanted to try this out on one of the sites I support but when I installed the BlogTNG plugin my Dokuwiki install just started displaying blank pages. The only hint of a problem was in the […] Continue reading

Posted in centos, dokuwiki, package management, PHP, plugins, redhat, rpm, Syndicated, tip, tips & tricks | Comments Off on Getting the BlogTNG plugin working in Dokuwiki under CentOS 5