System
16/06/2016
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 ...
Change the IPTables log file
An important aspect of any firewall are the log files. Iptables on Linux provides logging functionality, however by default, it ...
How to monitor a Linux server and desktop remotely from web browser
Monitoring Linux serverWhen it comes to monitoring a Linux server, there are more than enough options to choose from. While ...
How to sniff HTTP traffic from the command line on Linux
Suppose you want to sniff live HTTP web traffic (i.e., HTTP requests and responses) on the wire for some reason ...
How to access a Linux server behind NAT via reverse SSH tunnel
You are running a Linux server at home, which is behind a NAT router or restrictive firewall. Now you want ...
25 Useful Basic Commands of APT-GET and APT-CACHE for Package Management
This article explains how quickly you can learn to install, remove, update and search software packages using apt-get and apt-cache ...
