B<sudo> quits with an exit value of 1 if there is a
configuration/permission problem or if B<sudo> cannot execute
the given command. In the latter case the error string is
-printed to stdout via perror(3). If B<sudo> cannot stat(3)
+printed to stderr via perror(3). If B<sudo> cannot stat(2)
one or more entries in the user's PATH the error is printed
-on stdout via perror(3). (If the directory does not exist
+on stderr via perror(3). (If the directory does not exist
or if it is not really a directory, the entry is ignored and
no error is printed.) This should not happen under normal
circumstances. The most common reason for stat(3) to return