System
16/06/2016
Easy Ubuntu 16.04 Server Firewall
If you read our previous article Easy Ubuntu Server Firewall, then you may have noted that on Ubuntu 16.04 the ...
Getting started with Let’s Encrypt SSL Certificates on Ubuntu
This tutorial will guide you through your very first configuration of an SSL website with Let's Encrypt certification. Let's Encrypt ...
Inotify: Efficient, Real-Time Linux File System Event Monitoring
Summary - or why should I monitor the filesystem at all? The need to scan a given filesystem for changes ...
How can I find out if a specific program is installed?
there's always apt-cache policy <package-name> (no sudo needed). Not installed: olivier@neews:/$ apt-cache policy gnuift gnuift: Installed: (none) Candidate: ...
How do I replicate installed package selections from one Debian system to another? (Debian Wheezy)
To clone a Debian installation, use the apt-clone utility. It's available (as a separate package, not part of the default ...
Better than Time Machine: backup your Mac with rsync
Backup your Mac with rsync Using rsync: We all know we need to make backups. Apparently, 30% of all computer ...
Do-It-Yourself Backup System Using Rsync
What is rsync? Rsync is a program for synchronizing two directory trees across different file systems even if they are ...
Techniques de scan de ports
GénéralitésComme un débutant tâchant d'effectuer une réparation automobile, je peux me battre pendant des heures en essayant d'utiliser convenablement mes ...
Copy a folder overwriting ONLY smaller files in destination
I have tons of PDFs in multiple sub-folders in /home/user/original that I have compressed using ghostscript pdfwrite in /home/user/compressed. ghostscript has done a great job at compressing ...
OTPW – A one-time password login package
Abstract The OTPW package consists of the one-time-password generator otpw-gen plus two verification routinesotpw_prepare() and otpw_verify() that can easily be ...
10 Amazing and Mysterious Uses of (!) Symbol or Operator in Linux Commands
The '!' symbol or operator in Linux can be used as Logical Negation operator as well as to fetch commands ...
How To Secure Nginx with Let’s Encrypt on Ubuntu 14.04
Introduction Let's Encrypt is a new Certificate Authority (CA) that provides an easy way to obtain and install free TLS/SSL ...
Track Multiple Files Simultaneously With MultiTail
The tail utility is one of the most useful tools an admin has -- but it's also a bit limited ...
/etc/hosts vs. /etc/resolv.conf
From Wikipedia:resolv.conf is the name of a computer file used in various operating systems to configure the system's Domain Name ...
How to look up the geographic location of an IP address from the command line
If you want to find out where a given IP address is physically located on earth, there are quite a ...
