Ubuntu SSH: How To Enable Secure Shell in Ubuntu

SSH (Secure SHell) is possibly the best way to remotely access a Unix system – it's very secure thanks to automatic encryption of all the traffic, and it's also quite universal because you can do all sorts of things: access remote command line shell, forward graphics session output, establish network tunnels, set up port redirections and even transfer files over the encrypted session.

Today I'm going to show you how to get started with SSH in Ubuntu.

Installing SSH server in Ubuntu

By default, your (desktop) system will have no SSH service enabled, which means you won't be able to connect to it remotely using SSH protocol (TCP port 22). This makes installing SSH server one of the first post-install steps on your brand new Ubuntu.

The most common SSH implementation is OpenSSH. Although there are alternative implementations (closed source solutions and binary distributions maintained by various Unix and Unix-like OS vendors), OpenSSH is a de-facto standard in the secure transfers and connections industry. That's exactly what you want to install.

[Read more…]

Useful Solaris OS tips from my Solaris Blog

As some of you may know already, I've recently restarted my activity on another technical blog of mine: Solaris blog.

Solaris blog: http://solaris.reys.net

Solaris blog is the very first blog I started, I was actively posting new material in 2006-2007.  Since then my primary focus had shifted to Linux systems, but I realized that I miss Solaris so much that I still need to play with latest versions and features in Solaris 10 and OpenSolaris.

Today I'd like to offer you a few articles from Solaris blog, let me know if you find them useful:

Most of these topics are fairly technical and expect you to have previous knowledge of Solaris OS, but Unix Tutorial is here to take care of the basics – so ask away and I'll be glad to help you discover Solaris in my future posts.

How to Confirm Disks Capacity in Linux

show disk size in Unix is a very popular request visitors use to arrive at my Unix Tutorial pages. Since I never addressed the question of confirming the number of hard drivers available on your system or the task of finding out a disk's capacity, I'd like to document a quick and easy way of doing just that.

I hope that when someone looks for a way to show disk size, what's really expected is a command to help you confirm the capacity of a disk in gigabytes.

Using fdisk command in Linux

One of the easiest ways to learn a lot about hard drives installed on your Linux system is to use the fdisk command: [Read more…]

How To Confirm if Your CPU is 32bit or 64bit

I had to download a piece of software today for one of the servers which I haven't used in a while. A question of confirming the 64bit CPU capability came up, and I realized that I never mentioned it here on Unix Tutorial.

Some of you probably remember the uname command which also shows you similar information, but uname confirms the running kernel of your OS and not the CPU capability: if you're booted into 32bit mode, it will not help you to recognize the 64bit potential of your system.

Obtaining CPU information from /proc/cpuinfo

Most Linux distros will have the special /proc/cpuinfo file which contains a textual description of all the features your processors have. This is a very useful file – depending on your task it may help you identify any features of your processors, as well as confirm the overall number of CPUs your system has installed.

Most commonly, the following information is obtained from /proc/cpuinfo:

  • processor model name and type
  • processor speed in Mhz
  • processor cache size
  • instruction flags supported by CPU

[Read more…]

Ubuntu 9.04 Jaunty Jackalope screenshots

I'm finally getting ready to start publishing some tips with screenshots, so today it's just a humble screenshot tour of my fresh Ubuntu 9.04 install.

Let me know if you struggle with any graphics desktop functionality, and I'll try my best to help and show it with screenshots.

By the way: I really like one of the new community themes which come with Ubuntu 9.04, it's called the Dust theme.

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Interesting Unix reads – May 5th, 2009

Next batch of Unix-related news, this week it's just about announcing all the new releases of various distros.

Unix news

Unix-related releases

  • Wine 1.1.20 released – OLE copy/paste improvements, Direct3D code cleanup and traditional bug fixes

See also: