Use 7z to compress & encrypt zip files

Posted on April 4, 2018 by Ahmed Tawfik 
7z a -tzip -mem=AES128 -bd -y -pPASSWORD -mx=0 -- OUTPUT_FILE.zip file1 file2 file3 file3

This uses AES128 encryption and uses a compression rate of 0 (archive mode). You can pick a number up to 9 (highest compression rate)

Enjoy!

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A tiny script to replace all occurrences of a string in a file with another string

Posted on March 29, 2018 by Ahmed Tawfik 
sed -i 's/original/new/g' filename.txt

This basically replaces every occurrence of the “original” string with the “new” string in the file named “filename.txt”

e.g.

sed -i 's/192.168.0.1/192.168.1.1/g' /etc/fstab

Will replace all occurrences of the IP “192.168.0.1” with the IP “192.168.1.1” in the “/etc/fstab” file.

That’s it, Enjoy!

Sources: 

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My favorite drop-down terminal for Linux

Posted on March 29, 2018 by Ahmed Tawfik

It’s Tilda! My previous best was Guake, but it’s having compatibility issues and not maintained frequently like this one.

sudo apt install tilda

Very customizable and has a lot of options, including position, colors, scroll bars and transparency.

Tested on Ubuntu 17.10 (Works ONLY on Xorg, not Wayland).

Screenshot from 2018-03-29 10-30-17

Tilda on Ubuntu 17.10

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How to connect to your MS Exchange Account (Mail, Contacts, Calendar…etc) from Linux

Posted on March 28, 2018 by Ahmed Tawfik

Just go to Online Accounts -> Microsoft Exchange -> Type your e-mail and password!

Screenshot from 2018-03-28 09-36-37

This basically connects using Exchange Web Services (EWS).

If this doesn’t work out with you, click on custom and enter your username and server. I had to do that in my case, since my mail server’s address was different from the mail address.

That’s it! Enjoy! Here are some screenshots showing the results :))

Screenshot from 2018-03-28 09-51-42

Evolution Contacts

Screenshot from 2018-03-28 09-47-12

Evolution Calendar

Screenshot from 2018-03-28 09-43-46

Evolution Mail

Note: Tested and worked perfectly in Ubuntu 17.10 (Gnome 3.26).

Sources:

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How to cut video and audio without re-encoding using ffmpeg

Posted on March 12, 2018 by Ahmed Tawfik 
ffmpeg -i source_video.mp4 -t 50 -c copy output_video.mp4

This cuts the first 50 seconds of the video named source_video.mp4 and outputs them without any re-encoding to output_video.mp4

Another example for audio files:

ffmpeg -i input_file.mp3 -ss 00:00:05 -t 00:00:21 -c copy output_file.mp3

This cuts the audio file from the 5th second to the 21st second and places it in a file named output_file.mp3, no re-encoding done whatsoever.

Source: https://ubuntuforums.org/showthread.php?t=2027333

 

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