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[news.eclipse.platform] Calling external commandline programs to filter data

I am seeking for a way to process data from an Eclipse editor window and save the transformed data in an external file; the data transformer is an already existing external Unix shell program that expects as input either a stream of data or the name of a file that contains the data.

Searching through published Eclipse plugins I found something called "Emacsish" (to call shell programs from within Eclipse) that seems to go in that direction, but it's not quite what I need it seems.

So my newbie question is; is there any plugin that makes it possible to filter the Eclipse editor contents by using an external commandline filter program and create a new data file from the result? Or is there any other way how to achieve such tasks with Eclipse? Or, as a last ressort; would it be necessary to re-implement all the external filter programs as Eclipse plugin Java programs?

Any enlightenment and all suggestions very much appreciated!