In order to display graphical user interface GUI of various software tools, you need to enable the X display forwarding. Log in using the -X option in ssh client:
In order to display graphical user interface GUI of various software tools, you need to enable the X display forwarding. Log in using the -X option in ssh client:
```console
```console
local $export DISPLAY=localhost:0.0
local $ssh -X username@cluster-name.it4i.cz
local $ssh -X username@cluster-name.it4i.cz
```
```
!!! tip
If unable to execute graphical sofware showing error message "cannot open display" then try export DISPLAY variable before log in using the -X option in ssh client: