Instead of flagging a file with @samp{D}, you can @dfn{mark} the
file with some other character (usually @samp{*}). Most Dired
commands to operate on files use the files marked with @samp{*}. The
-only command that operates on flagged flies is @kbd{x}, which expunges
+only command that operates on flagged files is @kbd{x}, which expunges
them.
Here are some commands for marking with @samp{*}, for unmarking, and