====== Computing and software ======

<WRAP center round important 60%>
**First two most important things:**

  - Make backups and save your data (e.g. with tar/zip and rsync/scp)! All home directories will be permanently deleted when the container is removed!
  - If you use iraf, start and use iraf **only in ~/iraf** or its subdirectories, i.e. type ''cd ~/iraf''. Otherwise iraf will not work (more about iraf later)
</WRAP>

===== Connecting to the container computer =====

You can use x2go to connect to the container. Usernames and passwords will be provided by the course organizers.


==== Connecting with x2go ====

For information on the installation of x2go, see: https://wiki.x2go.org/doku.php/doc:installation:x2goclient

To connect to the container with x2go, please use XFCE as the session type. Here are typical settings (of course use your user account login):

{{:esodata_2024:x2go.png?400|}}


==== Using SSH to connect ====

In case of ssh, the command is

   ssh -Y USER@tube.utu.fi
   
on Linux.


===== Setting up software =====

==== EsoReflex ====

To activate EsoReflex software, write the command ''esoreflex'' in a terminal.

==== Iraf ====

Note: you have to do the following every time you open up a new window!

1) To activate **iraf** related software, in your current terminal, write the command ''iraf27'' and ''cd ~/iraf''

1b) If this is the first time you use IRAF on the container, write the command ''mkiraf'' in your iraf27 terminal **in the iraf folder**. It will ask about the terminal type, write ''xgterm'' and this will create a login.cl file to the iraf folder.

2) In the iraf folder with the iraf27 terminal write the command ''xgterm &''

3) Write the command ''cl'' to your newly opened xgterm terminal to start iraf.

4) To open **ds9** write the command ''ds9 &'' in the iraf27 terminal.

**Note, that you have to process your data within your iraf folder or any subfolder you create there.**\\

==== Starlink Gaia ====

To activate starlink (https://www.eaobservatory.org/~s.graves/WWW/) software, e.g. **gaia**, write the command ''starlink'' and then ''gaia''

==== Fv ====

To activate Fv software, write the command ''iraf27'' and then ''fv''

==== Log Out or Exit====

When you finish your session on the course container, you can exit just by killing the remote desktop client window. You will return to the same desktop when you log in again. You can log out from the session via Applications → Log Out → Log Out.

{{:not_course_2021:logout.png?200|}}

==== Returning to x2go ====

Sometimes when you return to x2go session especially if the session is still running in another client, the client asks whether to **suspend** or **terminate** the session. Usually you want to **suspend** and then **resume**. **terminate** will kill the running session and start a new.

==== Enjoy! ====