difference btw diff and dwdiff and other cmd line

[live]

1/ I haven't catch the difference between dwdiff, diff or dircomp

If one wants to only output files (JPEG, doc, etc.), which have been created, absent or modified
The command:
diff -r -q
works well, any advantage for another command?
Subtilities between commands for issues like:
* identical content, but renamed files
* identical names & date & weight, but different content (virus)

2/ Is there a way to tell diff to store in a specific directory all missmatched files?
Something as
diff - r -q oldBackup actualData /media/sda1/discrepant
Where diff would store in media/sda1/discrepant all files which are new or modified after comparison between oldBackup and actualData

Thanks.

[alf55]

2/ Is there a way to tell diff to store in a specific directory all missmatched files?
Something as
diff - r -q oldBackup actualData /media/sda1/discrepant
Where diff would store in media/sda1/discrepant all files which are new or modified after comparison between oldBackup and actualData

That is what redirection is for.

diff - r -q oldBackup actualData  > /media/sda1/discrepant

or

diff - r -q oldBackup actualData  | tee /media/sda1/discrepant

The first puts the data only in the file while the second scrolls it on the screen and puts it into the file.

Other diff programs include (but not limited to):
tkdiff, vimdiff, gvimdiff, tkdiff, bsdiff, dirdiff, vbindiff, easydiff, kdiff3, colordiff, adiff, diffpdf, ssddiff, wdiff, xmldiff, cmp, comm