kdiff3 software package provides compares and merges 2 or 3 files or directories, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kdiff3
kdiff3 is installed in your system.
Make ensure the kdiff3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep kdiff3 *
You will get with kdiff3 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | KDE |
| Package | kdiff3 |
| Version | 0.9.98-1+b1 [s390x], 0.9.98-1 |
| Description | compares and merges 2 or 3 files or directories |
| Sub Section | KDE |