linux

How to Store Data in Outer Space

Computer devices and phones used in outer space or outside the planet earth require some modification. These devices must be designed to withstand extreme space conditions and to operate in a near-absolute vacuum. Similarly, storing data in space requires specific devices such as magnetic tapes and solid state disks (SSDs). The challenge with magnetic tapes …

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How to calculate hash MD5-SHA1-SHA-256-CRC32 in Windows Linux Mac and online

What they are  Hash are used in computer science to map a string (a sequence of bits) of arbitrary length into a string of predefined length.  It is a sort of ‘signature’ of an electronic document. For each string you can calculate a hash, so each different string will have different hashes.  However, calculating the …

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Install and configure Apache web-server on Ubuntu or Debian (RaspberryPi)

To create an Apache-based web server, using a common Ubuntu or Debian machine, proceed as follows.   1. Install Apache  sudo apt-get update  sudo apt-get install apache2  To check if it’s correctly installed, go to the site  localhost  you should find ‘It works!  2. Configuration   All configuration files can be found in  “/etc/apache2”  this can be displayed via …

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How to check if an email address exists an is reachable

This is a common occurrence where you receive at least one rejection email with the following Message Delivery Status (or Subsystem), as a result of sending it to a problematic or non-existing address.   So to check if an address actually exists or  ‘receives’ mail you could simply send an email to that address (with the ‘delivery notification’ flag active) …

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