Tag: CommandLine

rsync

rsync with Practical Examples

rsync(remote sync) commonly found on Unix-like systems which is a remote/local file synchronisation utility where It uses an algorithm that minimises the amount of data copied by only moving the portions of files that have changed. Without beating around the bush let’s get our hands dirty. I found this link really interesting. Also check out this link for the difference between scp and rsync.

Basic syntax and options of rsync

rsync options source destination
  • -v , –verbose : verbose
  • -r , –recursive : copies data recursively (but don’t preserve timestamps and permission while transferring data)
  • -a , –archive : archive mode( copy files recursively and preserve symbolic links, file permissions, user & group ownerships and timestamps)
  • -z , –compress : compress file data
  • -P , –progress : show progress during transfer

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Remote Login Linux

Remote login with GUI in Linux – VNC

Hey there! How’s it going? Today what we are going to do is remotely connect to a linux machine with a GUI. Better than ssh right? For that we’ll be using VNC.

So VNC?

Virtual Network Computing (VNC). VNC is a graphical desktop sharing system. It uses Remote Frame Buffer protocol (RFB) protocol for the communication. If you are curious about the operation,

“The VNC server is the program on the machine that shares its screen. The server passively allows the client to take control of it. The VNC client (or viewer) is the program that watches, controls, and interacts with the server. The client controls the server.” – Wikipedia

We are using x11vnc as the VNC tool. Package: x11vnc, VNC server to allow remote access to an existing X session. Below is the simplest way to get the job done. Let’s dive in. SSH should be configured before hand.
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Soap Request Curl Linux

Let’s make a SOAP request from command line(curl)?

Hellow there folks! These days most of the web services are exposed as REST or SOAP. There could be a chance where you need to make a request from your command line rather than installing a tool such SOAPUI. Tools are really helpful but there are times where you can’t use tools. I’ll be using curl to make the request. if you don’t know about curl it can transfer data using various protocols. If you don’t have curl installed use the below command.

sudo apt-get install curl

 

SOAP Request Flow

SOAP request

Image Courtesy : java-forums.org

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How to SSH without a password

What’s SSH & SSH Keys

SSH A.K.A Secure Shell is used to make remote connections between computers to execute commands. A username and password is used for the authentication purpose when establishing the connection. If you have a very strong password, it’s almost 100% secure to use SSH since the data transmission is encrypted. But are you comfortable with typing the lengthy password every time you want to SSH? Also every time you type your password, you are sending your password over the network. So anyone who is eavesdropping on your connection will be able to intercept and crack your password. But if you switch to SSH keys you haven’t got anything to worry because your password is never transmitted over the network. Check out image below to get a vivid idea about the concept. So let’s get down to business(happy-face).

SSH Tunneling

Image Courtesy : addictivetips.com

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