How to disable cell broadcasts on Cyanogen Mod 11 on Note 1 (GT-N7000)

If you installed Cyanogen Mod 11 on a Samsung Galaxy Note 1 (GT-N7000) phone, you would find that your cell phone keeps serving messages. These messages are Cell Broadcasts. In my location, these messages were more than 6 a minute and appeared each time the cell phone tower location waves changed. It becomes too difficult . . . → Read More: How to disable cell broadcasts on Cyanogen Mod 11 on Note 1 (GT-N7000)

Evolution keeps asking for passwords in Ubuntu after updates

After an update, the Evolution email client on Ubuntu 14.04 LTS would not remember any passwords. Each time it tries to retrieve messages, it asks that passwords be entered. Even though the check box to Add the password to the key ring is clicked, it never stopped asking. It neither stored passwords in the key . . . → Read More: Evolution keeps asking for passwords in Ubuntu after updates

How to revoke a GnuPG / GPG key in Linux

If your Gnu Privacy Guard or GPG or GnuPG key has been compromised or something has gone wrong, you can revoke your key. Make sure that you generated a revocation certificate and stored in a safe place to do so.

To revoke a key, open a terminal in Linux, and enter the following command: $ . . . → Read More: How to revoke a GnuPG / GPG key in Linux

How to generate a revocation certificate for your GnuPG / GPG key

Whenever you create a key pair using GNU Privacy Guard, you need to make sure you also generate a revocation certificate for your key. Sometimes, keys are lost, misplaced, deleted, passwords forgotten and so on. To ensure that you revoke the keys you created, you need a revocation certificate. Simply deleting a key file or . . . → Read More: How to generate a revocation certificate for your GnuPG / GPG key

How to list GnuPG or GPG public keys

When you create or generate a new GPG or GnuPG key pair, it is stored in your key ring. Keys stored within the key ring can be listed using using the command as below in the Linux terminal.

$ gpg –list-public-keys <enter>

/home/user/.gnupg/pubring.gpg —————————— pub 4096R/3949C65A 2014-11-28 [expires: 2015-11-28] uid John N. Doe <john.doe@emaildomain.com> . . . → Read More: How to list GnuPG or GPG public keys

How to create a GNU Privacy Guard (GPG) GnuPG key pair for yourself

Many of us would like to protect our data stored in files, emails, online and elsewhere. The point is, that with the kind of investigative eyes on user data worldwide, we need a robust mechanism that does not leak. One of those mechanisms is PGP – Pretty Good Privacy. Pretty Good Privacy or PGP as . . . → Read More: How to create a GNU Privacy Guard (GPG) GnuPG key pair for yourself

Extract the audio from an MP4 video file using avconv

At times, we would like to extract the audio from an MP4 video file. To do this in Linux, open a terminal window in Ubuntu and use the utility called avconv as follows: $ avconv -i MyVideoFile.mp4 -vn -acodec copy MyAudioFile.aac <enter>

where, MyVideoFile.mp4 is your mp4 video file. You can then listen to the . . . → Read More: Extract the audio from an MP4 video file using avconv

Replace comma with new line in a text file using tr in Linux

If you have a CSV file and want to replace each comma with a carriage return or new line in Linux, you can do so using the tr command. Below is an illustration of how it can be done.

Open a terminal window, then type the following command.

$ cat mycsvfile.txt | tr ‘,’ ‘\n’ . . . → Read More: Replace comma with new line in a text file using tr in Linux

Libreoffice window resizing corrupts the window display in Ubuntu 13.04

In Ubuntu 13.04 or Xubuntu 13.04, you will notice a corruption to the LibreOffice window, whenever you do a resize. To prevent this, do, open a new terminal window, and enter following command: $ sudo apt-get install libreoffice-gtk <enter>

Extended Attributes in Linux filesystems like ext4

The capacity of storage has increased by leaps and bounds over the past decade. This has resulted in an explosion of the variety and quantum of data stored on it. There are no clear measures to control this explosion. For example, if you create a temporary file to store some comments on it, you always . . . → Read More: Extended Attributes in Linux filesystems like ext4

February 2019
M T W T F S S
« Jan    
 123
45678910
11121314151617
18192021222324
25262728