Comparing stuff

To compare files I used to be very blunt and use

diff $file1 $file2

but then my front-desk mate said "Add | vimdiff - ". He has shared some ideas on how to compare stuff with another colleague of ours.

In the meantime, my boss introduced me to tkdiff and I absolutely loved it.
As a good open source software ;) works on Linux, Mac and M$ Window$ :)

So enjoy!