KDiff3 for merging files

Note that if you start KDiff3 with the command line option --reverse then all layouting will be done right to left too. (This is a feature provided by Qt™.)

kdiff3 opens the GUI then fails to open the files at first, showing two dialogs. Then after I close the dialogs, kdiff3 manages to open the files correctly.

KDiff3 is a versatile file and directory comparison tool that merges up to three files, highlights differences with color-coded syntax, and resolves conflicts. Changelog · About Us · Screenshot · Guide

Via --config you can specify a different config file. When you often use KDiff3 with completely different setups this allows you to easily switch between them.

KDiff3 is a file and directory diff and merge tool which compares and merges two or three text input files or directories,shows the differences line by line ...

kdiff3 is a program that compares two or three input files shows the differences line by line and character by character provides an automatic ...

kdiff3 is a program that compares two or three input files, shows the differences line by line and character by character, provides an automatic merge-facility.

kdiff3 is a GUI diff tool that allows you to create a diff of two/three files and selectively choose which lines make up the merged file.

I want to be able to pass a command line option to silently install it in a specific directory, but I can't find any documentation about it.

I've explored the menus and command line options and can't seem to find the right option. Here's how I'm running it: kdiff3 ~/left_file.txt ~/ ...