Shrink - Extend Line

                                        
Trims or lengthens a line so that it meets another object. Double lines and multi lines can also be used.

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Local menu option:
Cleanup: Relevant for double lines, makes the cutlines invisible, forming a clean intersection. See Double Line Options.
Note: You can use Shrink / Extend Line on splines and Beziers, however the extension will be straight element of the curve, not curved continuations as they are with arcs.
Note: Most standard Modify tools, such as Trim, Split, and Meet 2 Lines, will work with walls.