Editing EAGLE (program) (section)

== Features ==
EAGLE contains a [[schematic editor]], for designing [[circuit diagram]]s. Schematics are stored in files with .SCH extension, parts are defined in device libraries with .LBR extension. Parts can be placed on many sheets and connected together through ports.

The [[Printed circuit board|PCB]] layout editor stores board files with the extension .BRD. It allows [[back-annotation]] to the schematic and auto-routing to automatically connect traces based on the connections defined in the schematic.

EAGLE saves [[Gerber File|Gerber]] and [[PostScript]] layout files as well as [[Excellon file|Excellon]] and [[Sieb & Meyer]] drill files. These are standard file formats accepted by [[PCB fabrication]] companies, but given EAGLE's typical user base of small design firms and hobbyists, many PCB fabricators and [[PCB assembly|assembly shops]] also accept EAGLE board files (with extension .BRD) directly to export optimized production files and [[SMT placement equipment|pick-and-place]] data themselves.

EAGLE provides a multi-window graphical user interface and menu system for editing, project management and to customize the interface and design parameters. The system can be controlled via mouse, keyboard hotkeys or by entering specific commands at an embedded [[command line]]. Keyboard hotkeys can be user defined. Multiple repeating commands can be combined into [[script file]]s (with file extension .SCR). It is also possible to explore design files utilizing an EAGLE-specific object-oriented programming language (with extension .ULP).