In praise of --dry-run 5 years ago
Perforce’s command line app uses this pattern for one of its most dangerous commands: p4 obliterate //depot/path/... which prints out exactly which files will be obliterated from the server (which not only removes their entire history, but can corrupt other files too if you don’t p4 snap them first).
To actually carry out the obliterate action, you have to add the -y option.