meld
Graphical diffing and merging tool. tldr-pages
On several platforms
Several platforms
Start meld
meldIdentifyCompare 2 files
meld path/to/file_1 path/to/file_2IdentifyCompare 2 directories
meld path/to/directory_1 path/to/directory_2IdentifyCompare 3 files
meld path/to/file_1 path/to/file_2 path/to/file_3IdentifyOpen a comparison as a new tab in a pre-existing meld instance
meld --newtab path/to/file_1 path/to/file_2IdentifyCompare multiple sets of files
meld --diff path/to/file_1 path/to/file_2 --diff path/to/file_3 path/to/file_4Identify