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38.10 File Comparison with Dired

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 Setting 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.

The backup file is the first file given to diff.


 
 
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