How to obtain and install X11 for Mac
About X11 for Mac: X11 is no longer included with Mac, but X11 server and client libraries are available from the XQuartz project. For more information:
XQuartz 2.7.11 | Version 2.7.11 | Released 10-29-2016 | OS X 10.6.3 or later
The XQuartz project is an open-source effort to develop a version of the X.Org X Window System that runs on OS X.Quick Download
X11 Shortcuts (i.e. Copy & Paste, Menus, Scrollbars, etc):
When in an X11 application, to get the Main Options contextual menu:Control + Mouse Click
To get the VT Options contextual menu:
Control + Option + Mouse Click
To paste:
Option + Click
To Paste between a Mac OS X native app and an X11 app, first copy from the Mac OS X app (Edit menu > Copy), then Option + Click in the X11 app.
To Paste between an X11 app and a Mac OS X app, in the X11 file menu, select Edit > Copy and then select Edit > Paste in the Mac OS X app menu.
X11 Customization and PATH export:
To have the scrollbar automatically appear when a new xterm window is created from the X11 menu (and to perhaps source the shell files so that PATH's are kept, etc):
In Apple X11's Applications menu, choose Customize and change the entry for xterm to: xterm -sb
You can also make it (for Fink): source /sw/bin/init.sh ; xterm -sb
Or, shell startup file specific (bash): source .profile ; xterm -sb
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For more support: https://www.xquartz.org/Support.html