Category Archives: Linux

Keeping the Root Hints Current

Posted on July 25, 2008 by Raymond

To keep the root hints file current, use the following command. $ dig @a.root-servers.net . ns > db.cache

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How to check your DNS configuration and zone files

Posted on July 25, 2008 by Raymond

If you are running BIND 9, you have handy new tools to help maintain your nameserver files: named-checkconf and named-checkzone. These tools reside in /usr/sbin or /usr/local/sbin. named-checkconf checks the configuration file for syntax errors. $ /usr/sbin/named-checkconf zonename db.local zone … Continue reading →

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Installing your own DNS Server

Posted on July 23, 2008 by Raymond

This how-to assumes a Debian-type Linux server.  1)  Install BIND $ sudo apt-get install bind9 2)  Run BIND chrooted.  For security reasons we want to run BIND chrooted so we have to do the following: $ sudo /etc/init.d/bind9 stop Edit … Continue reading →

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How to check if nameserver is valid (NS1.example.com, NS2.example.com)

Posted on July 23, 2008 by Raymond

A.  How to check if nameserver is valid $ dig ns com ;; ANSWER SECTION: com. 93009 IN NS a.gtld-servers.net. com. 93009 IN NS b.gtld-servers.net. com. 93009 IN NS c.gtld-servers.net. com. 93009 IN NS d.gtld-servers.net. com. 93009 IN NS e.gtld-servers.net. … Continue reading →

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Create thumbnails from image in one command

Posted on July 9, 2008 by Raymond

In Linux, issue this command $ convert -thumbnail 200 INPUT_FILE.png OUTPUT_FILE.png To convert into another image type, just change the output file extension — as simple as that! $ convert -thumbnail 200 INPUT_FILE.png OUTPUT_FILE.jpg For more information please visit Cyberciti.biz … Continue reading →

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How to remove .svn folder

Posted on March 30, 2008 by Raymond

Windows: Save the following to the folder to clean to a filename with a .cmd extension (cleansvn.cmd).  After that issue the command, eg., C:\www>cleansvn for /f “tokens=* delims=” %%i in (‘dir /s /b /a:d *svn’) do ( rd /s /q … Continue reading →

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How To Copy a DVD/VCD Using Mplayer/Mencoder

Posted on March 20, 2008 by Raymond

Here’s the command: mencoder dvd://4 -oac copy -avc copy mencoder is the executable program dvd:// is the name of the input device 4 means the fourth track. You can omit this information to copy the whole disc. -oac copy means … Continue reading →

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Vi is misbehaving with my arrow keys!

Posted on February 21, 2008 by Raymond

(Note: The following blog entry is for Linux users and may not be of any use to Windows users.  No discrimination intended.) In my earlier days, I always use nano as my editor of choice whenever I’m on a Linux … Continue reading →

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