meld

Graphical diffing and merging tool. More information: https://meldmerge.org/.

• Start meld:

meld

• Compare 2 files:

meld path/to/file_1 path/to/file_2

• Compare 2 directories:

meld path/to/directory_1 path/to/directory_2

• Compare 3 files:

meld path/to/file_1 path/to/file_2 path/to/file_3

• Open a comparison as a new tab in a pre-existing meld instance:

meld --newtab path/to/file_1 path/to/file_2

• Compare multiple sets of files:

meld --diff path/to/file_1 path/to/file_2 --diff path/to/file_3 path/to/file_4