Understanding and using ssh correctly

Everything you always wanted to know about ssh, ssh keys, the passphrase and ssh agent, but were afraid to ask At least everything you need to know, without getting bored to death

A quick introduction

ssh is a program for logging securely into a remote machine and for executing commands on a remote machine

More precisely ssh is an SSH client using the SSH protocol

We assume below that you have a my_login account on the remote some_server computer, and you know your password

This page will also show some examples using the LSCE and IPSL (ciclad) servers

Instead of a password, you can also use a set of private and public keys and a passphrase

Many programs are said to work over ssh when they implicitly use the ssh protocol to securely transfer their data from one server to another: scp (copy remote directories and files), rsync (synchronize remote directories and files), …

Before you were born, and the word and internet were a safer place, people used less secure programs like telnet, rlogin, rsh, ftp, …

Using ssh

On a Linux computer

A recommended ssh client for Windows

Just transferring files

Using ssh keys

Using an ssh agent

More...

If you want to know more (options, etc…), check the man(ual) page on Linux: man ssh

emacs

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