Kate

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 Kate (aka Kde Advanced Text Editor) is a TextEditor for Unix/Linux? systems running KDE.

 Author:   KDE organization
 Homepage: http://kate.kde.org
 Family:   LinuxEditorFamily
 License:  GPL
 Platform: Linux with KDE

It is quite customizable, and includes projects and other advanced features geared towards programmers. It also supports plugins to allow for enhancement. It has a command line and commands that can modify its settings, but unfortunately no commands for editing data.

 Screenshot: