Use Dq Li (double-quoted literal) instead of Ic (internal command) to

mark up a sample invocation, since it is not a command internal to the
described utility.

Do not use Ar (argument) to mark up something which is not an argument
to the utility or one of its internal commands.

bin/cat/cat.1

@@ -186,7 +186,5 @@ It appears to have been
 .Sh BUGS
 Because of the shell language mechanism used to perform output
 redirection, the command
-.Ic cat file1 file2 > file1
-will cause the original data in
-.Ar file1
-to be destroyed!
+.Dq Li cat file1 file2 > file1
+will cause the original data in file1 to be destroyed!