-Run script at the end of each tape. The script must return 0
-if the dump should continue without asking the user to change
-the tape, 1 if the dump should continue but ask the user
-to change the tape. Any other exit code will cause dump to
-abort.
+Run script at the end of each tape. The script must return 0 if
+.Nm
+should continue without asking the user to change the tape, 1 if
+.Nm
+dump should continue but ask the user to change the tape.
+Any other exit code will cause
+.Nm
+to abort.
+For security reasons,
+.Nm
+reverts back to the real user ID and the real group ID before
+running the script.