[comp.unix.questions] What is the usefulness of the -e option to diff3?

awilcox@eagle.wesleyan.edu (08/09/90)

What is the purpose of the various ed-script options to the diff3
program?  The -e option (for example), produces a script that will
modify the first file so that it includes changes made to the third
file, but does not include changes made solely to the second file.
Why is this useful?