Here are two Dired commands that compare specified files using
diff.
=
Compare the current file (the file at point) with another file (the file
at the mark) using the diff program (dired-diff). The
file at the mark is the first argument of diff, and the file at
point is the second argument. Use C-SPC
(set-mark-command) to set the mark at the first file's line
(see section H.1 Setting the Mark), since dired-diff ignores the files marked
with the Dired's m command.
M-=
Compare the current file with its latest backup file
(dired-backup-diff). If the current file is itself a backup,
compare it with the file it is a backup of; this way, you can compare
a file with any backup version of your choice.
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