How to prevent SSHD to listen on an address family

It is possible to control on which address family sshd will listen to. In /etc/ssh/sshd_config, simply add AddressFamily any to listen to IPv4 and IPv6 addresses. This is the default.

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How to assign a static IP address in Ubuntu

Setting a static IP address in Ubuntu involves editing /etc/network/interfaces. If the interface is currently using DHCP, you will find these lines in the file. auto lan iface lan inet

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How to change the network interface name in Ubuntu 12/13

Two files need to be modified to change the name of a network interface in Ubuntu. For example, if you want to change eth0 for lan, simply change the NAME

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How to find duplicate files on Linux?

It is pretty straight forward in Linux, install fdupes. sudo apt-get install fdupes Type the following command to display the documentation man fdupes

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Accessing a serial port from a web server

On most Linux distribution, it is impossible to access a serial port (ex. /dev/ttyS0) from a web server such as Apache or lighttpd using a cgi. Simply add the user

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Script listing all the keys on a memcache server

This script lists all the keys on a memcache server. #!/bin/bash nc localhost 11211 > /tmp/$$.1 <<EOF stats items EOF cut -d: -f2 /tmp/$$.1 | grep -v END | uniq

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Ralink RT5572 based WiFi Usb Dongle setup on Ubuntu 12.04

The WiFi USB dongles based on the newest RT5572 chip set do not work out of the box on Ubuntu.  Unex DNUR-V72, D-Link DWA-160 Rev B and TP-Link TL-WDN3200 dongles are

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Recording a terminal session under Linux

It is possible to record a terminal session under Linux with ttyrec. It also records vi, emacs, etc. sessions. Fisrt, install ttyrec sudo apt-get install ttyrec To start recording a

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How To Setup A Protected Wireless Connection Via the Command-Line

Setting up a wireless connection via the command line may vary depending on the USB Wireless Interface you are using. These instructions also work for the Raspberry PI running Wheezy.

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Masquerading or replacing outgoing SMTP email address with Postfix

Postfix can replace an outgoing email address by another one. To do so, you must perform these steps: Add in /etc/postfix/main.cf the following line smtp_generic_maps = hash:/etc/postfix/generic_maps Add in hash:/etc/postfix/generic_maps a

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Create an ext3 or an ext4 partition without a journal

Most of the time, having a journal for ext3 and ext4 partitions is pretty useful. Nevertheless, you can prevent creating a journal by adding the option ^has_journal. For example: mkfs

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Initializing a brand new disk with “parted”

“parted” is a replacement for “fdisk” of Linux.  It can handle disks larger than 2 TB.  Issue this command to launch “parted” where /dev/sdL is the disk you want to

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How to unmount an encrypted partition?

Unmount the partition umount /mnt Unmap the partition cryptsetup luksClose securebackup

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How to mount an encrypted partition?

Map the partition cryptsetup luksOpen /dev/sdXN securebackup Mount the partition mount /dev/mapper/securebackup /mnt

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How to setup partition encryption?

To setup partition encryption on Ubuntu, perform the following steps: Install the required software apt-get install cryptsetup For more security, erase the partition you want to encrypt with one of

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