Category Archives: Linux

Fix Bash vulnerability under Linux OS .

If some Bash code outside of the curly brace then it will then be executed by the linux system.

If your system is vulnerable, it will then output:

How Do You Fix It ?
Just open up a terminal, and type:

or under Fedora with :

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Calibre – best application to read your books.

I wrote about this application because I used often when I read books, programming books or documentation
Calibre is an open source e-book tool that allows you to:

      • organize your e-book library
      • convert e-books to various formats
      • interact with your e-book reader
      • Library Management
      • E-book conversion
      • Syncing to e-book reader devices
      • Downloading news from the web and converting it into e-book form
      • Comprehensive e-book viewer
      • Content server for online access to your book collection
      • E-book editor for the major e-book formats

Also can be used with Windows , Linux , Macintosh or calibre portable build can be run on any windows computer.
This is one screenshot , you can also customize this application.

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Sort files with ls by last modified date and time.

The ls –help come with this args :
-t sort by modification time, newest first
You need to pass the -t option to the ls command to sort by time modified.

Also if you want to reverse the order of the sort then use -r option.

Let see one example:

with iso time style

with full-iso time style

with long-iso time style

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How to convert mkv file into avi file format with ffmpeg.

This is very simple. You need to use ffmpeg tool.
If your file is named my_file.mkv then use this command:
ffmpeg -acodec copy -vcodec copy -i my_file.mkv out_file.avi
The output will be out_file.avi with directly copy the audio and video streams from the mkv to an avi .

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How to Change the Timezone in Linux.

A time zone is a region on Earth that has a uniform standard time for legal, commercial, and social purposes. It is convenient for areas in close commercial or other communication to keep the same time, so time zones tend to follow the boundaries of countries and their subdivisions.

How to do that into linux OS?

It changes /etc/localtime …

You will see this window to setup your localtime.


Another way to change the localtime it’s:

and select your local time by region …

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