====SSH Login====
 
Most experienced users use the fast SSH text interface to submit batch jobs. The alternative [[ portal_login_new | OpenOnDemand ]] web interface is needed for graphical jobs and is usually easier for new users (and can also provide an SSH terminal in a browser window).  

SSH text login will require a SSH client on your workstation and one of several [[ login_servers | login servers ]] depending on your internet location.

**Linux**
All Linux variants come with an SSH client "ssh" that runs in a standard terminal.  [[ file_transfer | File transfer apps ]] are "scp" and "sftp".

**Mac**
All Mac variants come with or can install an SSH client "ssh" that runs inside the standard "Terminal" app in "Utilities". [[ file_transfer | File transfer apps ]] are "scp" and "sftp".

**MS Windows**
Windows doesn't come with an SSH client.

If you want a lightweight client that runs from single executable(s) for lab and library computers, PuTTY has been available for many years.  Use the greenend.org.uk site, not google search results which might install malware.  You will want the ''putty.exe'' program for logging in, and either 'pscp.exe' or 'psftp.exe' for moving data, depending if you want the SCP or SFTP interfaces.
[[ https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html | PuTTY site ]]

If you have a reasonably powerful Win 11 or Win 10 system, we recommend Microsoft WSL or WSL2.  Install from Microsoft or from the MS store.  It will run a very good clone of a Linux system on your Windows box, so you can use the much superior Linux utility programs.  The default Linux distribution is Ubuntu.  If you want a distribution very much like the cluster, you can download Alma Linux 8 instead and do some software developing on your workstation, although it won't have all the application software that the cluster has.  WSL is a form of virtual machine so it takes more than minimal hardware to run well. Apps in WSL are ``ssh``, ``scp``, ``sftp`` like Linux.


There's also a program with an Explorer-like interface with an old but functional version freely available. It has terminal and file transfer apps [[ https://downloads.uark.edu/ssh/sshwinsecureshell-3.2.9.exe | sshwinsecureshell-3.2.9.exe direct download ]]

**Operation**

for username "rfeynman" and login host "pinnacle.uark.edu"

Linux/Mac/WSL: ``ssh rfeynman@pinnacle.uark.edu`` .  If you need a port (default 22) add ``-p 2022``.

Putty/WinSecureShell:  fill out terminal/file transfer app with user ``rfeynman``, host ``pinnacle.uark.edu``, port `22` or as needed.