s/-O/-C/

def_data.c

@@ -257,7 +257,7 @@ struct sudo_defs_types sudo_defs_table[] = {
 	NULL,
     }, {
 	"closefrom_override", T_FLAG,
-	"If set, users may override the value of `closefrom' with the -O option",
+	"If set, users may override the value of `closefrom' with the -C option",
 	NULL,
     }, {
 	"env_check", T_LIST|T_BOOL,

def_data.in

@@ -190,7 +190,7 @@ closefrom
 	"File descriptors >= %d will be closed before executing a command"
 closefrom_override
 	T_FLAG
-	"If set, users may override the value of `closefrom' with the -O option"
+	"If set, users may override the value of `closefrom' with the -C option"
 env_check
 	T_LIST|T_BOOL
 	"Environment variables to check for sanity:"

sudo.c

@@ -284,7 +284,7 @@ main(argc, argv, envp)
     /* Check for -C overriding def_closefrom. */
     if (user_closefrom >= 0 && user_closefrom != def_closefrom) {
 	if (!def_closefrom_override)
-	    errorx(1, "you are not permitted to use the -O option");
+	    errorx(1, "you are not permitted to use the -C option");
 	else
 	    def_closefrom = user_closefrom;
     }
@@ -768,7 +768,7 @@ parse_args(argc, argv)
 		if (NewArgv[1] == NULL)
 		    usage(1);
 		if ((user_closefrom = atoi(NewArgv[1])) < 3) {
-		    warningx("the argument to -O must be at least 3");
+		    warningx("the argument to -C must be at least 3");
 		    usage(1);
 		}
 		NewArgc--;

sudoers.pod

@@ -479,7 +479,7 @@ section.  This flag is I<off> by default.
 
 =item closefrom_override
 
-If set, the user may use B<sudo>'s B<-O> option which
+If set, the user may use B<sudo>'s B<-C> option which
 overrides the default starting point at which B<sudo> begins
 closing open file descriptors.  This flag is I<off> by default.