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Here are two Dired commands that compare specified files using
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-diffignores the files marked with the Dired's m command.
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.
The backup file is the first file given to