Mail Command Missing in Centos
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If the mail command is missing in CentOS you just need to install the mailx package.  You can do this with the following yum command:

yum install mailx

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Extract the audio from a flash video
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Extract the audio from a flash video.

ffmpeg -i video.flv -acodec copy track.mp3

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Unix / Linux: See Colourised Filesystem Disk Space Usage
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This is a neat little program which with give you a “graphical” display of the free space from the command line. http://www.cyberciti.biz/tips/unix-linux-bsd-pydf-command-in-colours.html

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Factory Reset The Linux OS
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I came across an interesting article the other day about the sys-unconfig command.  If you run the command it will wipe out all of your OS settings and re-runs the original setup after it reboots.

sys-unconfig

 

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How to configure VirtualBox to Auto start and stop Guest VM | CentOS | Linux Tutorial
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I had written a script similar to this one to handle my Virtual-box systems but they have it all put together nicely.

How to configure VirtualBox to Auto start and stop Guest VM | CentOS | Linux Tutorial.

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