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@@ -714,6 +714,16 @@ or months by passing an integer along with the first letter of the
duration, e.g., @code{--list-generations=20d}.
@end itemize
+@item --delete-generations[=@var{pattern}]
+@itemx -d [@var{pattern}]
+Delete all generations except the current one. Note that the zeroth
+generation is never deleted.
+
+This command accepts the same patterns as @option{--list-generations}.
+When @var{pattern} is specified, delete the matching generations. If
+the current generation matches, it is deleted atomically, i.e., by
+switching to the previous available generation.
+
@end table
@node Packages with Multiple Outputs