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[[Category:Tutorials|SSH X Forwarding and File Transfer]]<nowiki /> {{DISPLAYTITLE:SSH X Forwarding and File Transfer}}<nowiki /> {{Syllabus Introduction to Linux}}<nowiki /> __TOC__ This tutorial explains how to view a graphical program that runs on a remote computer, e.g. an HPC cluster, on your local computer with X-forwarding. It also describes how to copy files between your local computer and a remote computer as well as copying files between two remote computers with SCP. === Video === <!--T:5--> <youtube width="600" height="340" right>gOYsbBxKXas</youtube> ([[Media:HPC.NRW_Introduction_to_Linux_in_HPC_13_SSH_Graphics_and_File_Transfer.pdf | Slides as pdf]]) === Quiz === <!--T:5--> {{hidden begin |title = Which operating system do you need on your local computer to forward your graphical programs from a Linux cluster to it via ssh-X-forwarding? }} <quiz display=simple> { |type="()"} - This only works if your local computer runs Linux. || + This works if your local computer runs Windows, Mac OS, or Linux. || Explanation: For Mac OS you can use XQuartz and for Windows either xming or MobaXterm. - It works on any operating system out of the box. || </quiz> {{hidden end}} {{hidden begin |title = Is X-Forwarding with <code>-X</code> or with <code>-X -Y</code> more secure? }} <quiz display=simple> { |type="()"} + Only using <code>-X</code> instead of <code>-X -Y</code> is more secure. || Explanation: The argument <code>-Y</code> DISABLES some security measures because it assumes a trusted environment. - Using <code>-X -Y</code> instead of <code>-Y</code> is more secure. || - There is no difference. || </quiz> {{hidden end}} {{hidden begin |title = Can you access files on your local computer in a program that was started via X-forwarding on a different computer? }} <quiz display=simple> { |type="()"} + No. || Explanation: Even though the window is displayed on your local computer, the program runs on the remote computer. Thus, without any additional tools, you can only access the files on the remote computer. - Yes. || </quiz> {{hidden end}} {{hidden begin |title = Who can you copy a directory <code>mydir</code> on your local computer via scp to the home directory of the user <code>username</code> on the remote computer <code>remotehost</code>? }} <quiz display=simple> { |type="()"} - <code>scp mydir username@remotehost || - <code>scp mydir username@remotehost:~ || + <code>scp -r mydir username@remotehost:~ || Explanation: <code>-r</code> is required to be able to copy directories recursively. The target is specified as <code>username@remotehost:~</code>, where <code>~</code> is an abbreviation for the home directory of the user <code>username</code> on the remote computer. </quiz> {{hidden end}} {{hidden begin |title = Are there graphical variants that you can use instead of <code>scp</code>? }} <quiz display=simple> { |type="()"} - No. || + Yes. || Explanation: Examples are WinSCP, MobaXterm,... </quiz> {{hidden end}} {{Note|'''no exercises in this section'''}} {{Tutorial Navigation | previous = [[Introduction_to_Linux_in_HPC/SSH_Connections | SSH Connections ]] | main = [[Introduction_to_Linux_in_HPC | Overview ]] | next = [[Introduction_to_Linux_in_HPC/Various_tips | Various Tips ]] }}

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