slrn
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slrn (Select Region) is an application that querys for a selection from the user and prints the region to stdout. It grabs the mouse and turns it into a crosshair, lets the user click and drag to make a selection (or click on a window) while drawing a pretty box around it, then finally prints the selection's dimensions to stdout.

features
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* Hovering over a window will cause a selection rectangle to appear over it.
* Clicking on a window makes slrn return the dimensions of the window.
* Clicking and dragging causes a selection rectangle to appear, renders pretty well (compared to scrot). And will return the dimensions of that rectangle in absolute screen coords.
* On startup it turns your cursor into a crosshair, then adjusts the cursor into angles as you drag the selection rectangle.
* Supports simple arguments (change selection rectangle border size, x display, padding, etc. )