background preloader

SSH Tutorial for Linux - Support Documentation

SSH Tutorial for Linux - Support Documentation
This document covers the SSH client on the Linux Operating System and other OSes that use OpenSSH. If you use Windows, please read the document SSH Tutorial for Windows If you use Mac OS X or other Unix based system, you should already have OpenSSH installed and can use this document as a reference. This article is one of the top tutorials covering SSH on the Internet. What Is SSH? There are a couple of ways that you can access a shell (command line) remotely on most Linux/Unix systems. An unencrypted telnet session SSH, which is an acronym for Secure SHell, was designed and created to provide the best security when accessing another computer remotely. An encrypted ssh session These two diagrams on the left show how a telnet session can be viewed by anyone on the network by using a sniffing program like Ethereal (now called Wireshark) or tcpdump. Getting Started This tutorial isn't going to cover how to install SSH, but will cover how to use it for a variety of tasks. Generating a key exit Related:  CMU 2015BashCommands

Accessing Your Data — WebFaction User Guide Aside from the control panel, there are two other key ways to access your account and data. The first is by remotely working with each machine your account has access to with SSH. The second is with FTP. Connecting with SSH You can connect to a machine with SSH. To connect with SSH, use the following connection information: Host: server.webfaction.com, where server is your server’s name (such as web310 or dweb89). On Mac OS X and Linux systems, you can connect using the command line program ssh. On Windows, you need an SSH client, like PuTTY. Start the PuTTY application.In the Host Name (or IP address) field, enter username@server.webfaction.com where username is your SSH username.Click the Open button.The first time you connect, a PuTTY Security Alert appears. You’re now connected with SSH using PuTTY. Using SSH Keys You can use a password-less, key-based SSH authentication system with your WebFaction account. Linux and Mac OS X To create and deploy a key with Linux or Mac OS X: PuTTY Backups

Vi - Linux Text Editor LINUX CLASSES - TEXT EDITORS The vi editor comes with every version of Linux or Unix. It's a terribly unfriendly beast of an editor, but you should know about it because someday you're likely to find yourself on a system where you have no other choice but to use it. A friend of mine calls vi the Heart of Evil, but that might be just a bit harsh--you decide. Using vi is similar to using other editors in that you can see your file on the screen (this is not the case with a line editor, for example), move from point to point in the file, and make changes. But that's where the similarities end. Command and Input Mode The hardest thing to understand about vi is the concept of modes. When you start vi, you're in Command mode. Here's how to create a file from scratch using vi. vi cow.joke You'll see a screen that looks like this: Adding New Text to Your File Now press the letter a to enter Input mode and type the lines shown in here. Saving Your Work "cow.joke" 6 lines, 113 characters. Hmmm. . . .

WPILibJ: edu.wpi.first.wpilibj.image.NIVision Class Reference Class for interfacing with the NIVision libraries. More... Class for interfacing with the NIVision libraries. Author dtjones Calculates the histogram of each plane of a color image and redistributes pixel values across the desired range while maintaining pixel value groupings. Parameters Convert the given image into a binary image true where the colors match the given thresholds. Counts the number of particles in a binary image. Returns The number of particles Cleans up resources associated with images, regions of interest (ROIs), arrays, and reports that you no longer need. After you dispose of something, you can no longer use it. Extract the color planes from the given source image into the given planes. Get the height of an image. The height of the image. Get the width of an image. The width of the image. Allocates space for and creates a new imaq image. a newly allocated pointer to an imaqImage Returns a measurement associated with a particle. The value of the requested measurement.

OpenSSH/Client Configuration Files Client configuration files can be per user or system wide, with the former taking precedence over the latter and run-time arguments in the shell overriding both. In these configuration files, one parameter per line is allowed with the parameter name followed by its value or values. Empty lines and lines starting with the hash (#) are ignored. An equal sign (=) can be used instead of whitespace between the parameter name and the values. Values are case-sensitive, but parameter names are not. System-wide Client Configuration Files[edit] System-wide client files set the default configuration for all users of OpenSSH clients on that system. run time arguments via the shelluser's own configurationsystem-wide configuration The first value obtained is used. /etc/ssh/ssh_config[edit] This file defines all the default settings for the client utilities for all users on that system. it must be readable by all users. Below a shortcut is made for connecting to arc.example.org. /etc/ssh/sshrc[edit]

Lisp: Common Lisp, Scheme, Clojure, Emacs Lisp - Hyperpolyglot a side-by-side reference sheet grammar and invocation | variables and expressions | arithmetic and logic | strings | listsarrays | dictionaries | functions | macros | execution control | file handles | file buffers | files | directoriesprocesses and environment | libraries and namespaces | objects | reflection | java interop General version used Versions used to verify data in the cheat sheet. show version How to determine the version. compiler racket Compiling a.ss creates the byte-code compiled file a_ss.zo, which will be used by mzscheme in preference to the source code if it encounters making a standalone executable common lisp A standalone executable is created by the sb-ext:save-lisp-and-die function. In order for code to be compiled as a standalone executable, it must be packaged as a module. #lang scheme (define hello (printf "Hello world! A standalone executable can be created with DrScheme using Scheme | Create Executable… emacs Building Emacs shebang emacs lisp #! An implementation of echo: #!

OpenSSH Secure "how to" (ssh_config sshd_config) @ Calomel.org - Open Source Research and Reference Home RSS Search September 10, 2013 OpenSSH is a set of utilities to allow you to connect to a remote machine through an encrypted tunnel. You can use it as a terminal connection or to tunnel any data through a VPN interface. OpenSSH is a FREE version of the SSH suite of network connectivity tools that increasing numbers of people on the Internet are coming to rely on. Most operating systems come with one version or another of OpenSSH. SECURITY NOTE: Notice that we have specified the "Ciphers" for the client and server config files. Client side ssh config options (/etc/ssh/ssh_config) This config is for the client side options. Server side sshd config options (/etc/ssh/sshd_config) These directives are for sshd. Questions? Do you have a multi authentication script for OpenSSH ? Yes we do. Do you have any distributed scp and ssh shell scripts ? Indeed. How can I setup a reverse SSH connection? Using OpenSSL to encrypt and decrypt files Questions, comments, or suggestions?

Managing moduls on the Linux?kernel ? Tournas Dimitrios Posted by tournasdimitrios1 in Linux, Linux course. trackback While Linux is officially a monolithic kernel, it does permit dynamic extensibility with loadable kernel modules. In this article, we’ll explore the various tools and processes that support dynamic kernel customization. We’ll also explore the various configuration mechanisms available for module configuration. Linux is a monolithic kernel, which means that the kernel runs in the supervisory mode of the processor. Fortunately, while Linux is a monolithic kernel, it does provide the means for dynamic extension through the use of kernel modules. Linux kernel modules are also special in that they present two interfaces present only in modules. You’ll find kernel modules used in variety of ways that demonstrate how integral they are to Linux. Consider a monolithic kernel without loadable modules. Figure 1 Major Module Commands and their Relevant Files. lsmod> insmod $ insmod my_module.ko my_option=1 rmmod $ rmmod my_module depmod

FRC 2168 OpenCV library for the roboRIO and BeagleBone processors : WPILib OpenCV is the premier open source vision library and can be found in many commercial and research robots. From the OpenCV web site: “OpenCV is released under a BSD license and hence it’s free for both academic and commercial use. It has C++, C, Python and Java interfaces and supports Windows, Linux, Mac OS, iOS and Android. OpenCV was designed for computational efficiency and with a strong focus on real-time applications. Written in optimized C/C++, the library can take advantage of multi-core processing. FRC Team 2168 has done a build of OpenCV that is customized for the FRC competition robots that they are graciously contributing to the FIRST community. You can find additional information on this ChiefDelphi post and on their GitHub site. Tags: Vision

"Add correct host key in known_hosts" / multiple ssh host keys per hostname? Linux Classes SSH public keys From Noah.org SSH Key Generation Overview with no password This shows how to use unencrypted public keys for logging in to a remote SSH server without a password. The basic steps are: Create an RSA key-pair with an empty password (no encryption). Here are those steps as you would actually type them (`ssh-copy-id` does steps 2 and 3): ssh-keygen -q -t rsa -N '' -f ~/.ssh/id_rsa ssh-copy-id user@remote.example.com Here is what you would do without `ssh-copy-id`. ssh-keygen -q -t rsa -N '' -f ~/.ssh/id_rsa scp ~/.ssh/id_rsa.pub user@remote.example.com:/tmp/id_rsa.pub ssh user@remote.example.com "mkdir -p ~/.ssh;chmod 700 ~/.ssh;touch ~/.ssh/authorized_keys;cat /tmp/id_rsa.pub >> ~/.ssh/authorized_keys" Usually it's bad to use unencrypted public keys for logging in to remote servers without a password. The `ssh-copy-id` Script OpenSSH comes with `ssh-copy-id` which makes it much easier to setup your local host to connect to a remote server via SSH. ssh-copy-id username@example.com ssh-keygen

Configuring an Axis Camera | Vision Processing | 2015 FRC Control System Three different Axis camera models are supported by the FRC software, the Axis 206, Axis M1011 and Axis M1013. This document provides instructions on how to configure one of these cameras for FRC use. To follow the instructions in this document, you must have installed the NI 2015 FRC Update Suite and Configured your radio Connect the camera Connect the Axis camera to the DAP-1522 radio using an Ethernet cable. Axis Camera Setup Tool Browse to C:\Program Files (x86)\National Instruments\LabVIEW 2014\project\Axis Camera Tool and double-click on AxisCameraSetup.exe to start the Axis Camera Setup Tool. Tool Overview The camera should be automatically detected and the green indicator light should be lit. Setup the Camera To configure the camera, press Apply. Camera Webpage To set the network settings, open a web browser and enter the address shown next to Camera found at in the tool (in the example above this is 10.0.40.20) in the address bar and press enter. Setup Page Click Save. Click Save.

Related: