Author Archives: Ahmed Tawfik

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About Ahmed Tawfik

Cybersecurity Professional, Systems Engineer, OSS & Linux Geek

How to cut videos from the command line in Ubuntu 12.10 and later (Mint 14 and later)

Posted on May 21, 2013 by Ahmed Tawfik

avconv -i DP4U12.ogv -vcodec copy -acodec copy -ss 00:00:00 -t 00:04:20 DP4U12_complete.ogv The above command preserves the same format of the input file, where: DP4U12.ogv is the input file DP4U12_complete.ogv is the output file The command cuts the video from … Continue reading →

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How to extract multi-part, e.g. .z01, .z02 type of zip files on Ubuntu

Posted on May 3, 2013 by Ahmed Tawfik

I couldn’t extract an archive that I downloaded from edelivery which was in 3 files, 1.zip, 1.z01 and 1.z02: In order to extract on Ubuntu, do the following: zip -s- Input.zip -O output.zip This will gather the Input.zip file and … Continue reading →

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How to install the VirtualBox Extension Pack from the Command Line on Ubuntu

Posted on April 21, 2013 by Ahmed Tawfik

The following command was needed after upgrading the VirtualBox version to install the new version of the extension pack and replace the old one: sudo VBoxManage extpack install –replace Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack

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How to manually install a Gnome Shell extension

Posted on April 14, 2013 by Ahmed Tawfik

This is a must-know for those who love some old extensions that are no longer compatible with their new upgrade of gnome shell, since many extensions are already compatible with the new versions of the gnome-shell, but all what differs … Continue reading →

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How to extract a number from a string (not a file) in Bash

Posted on April 10, 2013 by Ahmed Tawfik

export hobba=ksjdjf123ksks export nokka=`sed “s/[^0-9]//g” <<< $hobba` echo $nokka 123 Sources: http://stackoverflow.com/questions/13055889/sed-with-a-literal-string-not-input-file, http://stackoverflow.com/questions/6388046/extract-integer-from-string-using-bash

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